Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Stock-based Compensation (Details Textual)

v3.23.2
Note 7 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Feb. 23, 2023
Share-Based Payment Arrangement, Expense $ 1,059,000 $ 638,000       $ 2,504,000 $ 1,647,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount 5,385,000   $ 5,385,000     $ 5,385,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition           2 years 10 months 24 days    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross           40,266 62,730  
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)           5 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)           3 years    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)           $ 64.38 $ 66.48  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)           2 years 6 months 10 days    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value 2,193,000   $ 2,193,000     $ 2,193,000    
Share-Based Payment Arrangement, Option [Member] | Minimum [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)           3 years    
Share-Based Payment Arrangement, Option [Member] | Maximum [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)           5 years    
Restricted Stock [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           41,492    
Bonus Stock Award [Member] | Share-Based Payment Arrangement, Employee [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           9,144    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share (in dollars per share)           $ 104.36    
Selling, General and Administrative Expenses [Member]                
Share-Based Payment Arrangement, Expense 1,016,000 606,000       $ 2,377,000 $ 1,552,000  
Cost of Sales [Member]                
Share-Based Payment Arrangement, Expense $ 43,000 $ 32,000       $ 126,000 $ 95,000  
The 2022 Plan [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)               1,461,461
The 2022 Plan [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Employee [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)           3 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           34,674 23,318  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share (in dollars per share)           $ 72.26 $ 66.48  
The 2022 Plan [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Nonemployee [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)           3 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           6,818 3,118  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share (in dollars per share)           $ 61.56 $ 64.11  
The 2022 Plan [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Nonemployee [Member] | Director [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         318   2,758  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share (in dollars per share)         $ 62.77   $ 63.35  
The 2022 Plan [Member] | Restricted Stock [Member] | Minimum [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)           1 year    
The 2022 Plan [Member] | Restricted Stock [Member] | Maximum [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)           10 years    
Employee Stock Purchase Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Market Price Percentage, Offering Date           85.00%    
Stock Issued During Period, Shares, Employee Stock Purchase Plans     7,754 5,585        
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price     $ 40.25 $ 53.52        
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant 168,251   168,251     168,251