Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock-based Compensation (Details Textual)

v3.22.0.1
Note 4 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Payment Arrangement, Expense $ 440,000 $ 289,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 4,935,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 2 years 10 months 24 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 62,730 105,089
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 5 years 5 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years 3 years
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) $ 66.48 $ 23.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) 2 years 3 months 25 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 10,911,000  
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 (in shares) 7,678  
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price (in dollars per share) $ 32.43  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 187,195  
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) 23,636  
Restricted Stock [Member] | Stock Compensation Plan 2007 [Member] | Share-based Payment Arrangement, Nonemployee [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 1 year  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 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) $ 62.77  
Restricted Stock [Member] | Stock Compensation Plan 2007 [Member] | Share-based Payment Arrangement, Employee [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 23,318 37,687
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) $ 66.48 $ 23.74
Restricted Stock [Member] | Minimum [Member] | Stock Compensation Plan 2007 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 1 year  
Restricted Stock [Member] | Maximum [Member] | Stock Compensation Plan 2007 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 10 years  
Selling, General and Administrative Expenses [Member]    
Share-based Payment Arrangement, Expense $ 409,000 $ 281,000
Cost of Sales [Member]    
Share-based Payment Arrangement, Expense $ 32,000 $ 8,000