Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock-based Compensation (Details Textual)

v3.19.3.a.u2
Note 4 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Jun. 30, 2019
Share-based Payment Arrangement, Expense $ 240,586 $ 538,524    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 2,650,700   $ 2,650,700  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 4 years 255 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 116,600 172,000    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years 284 days 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years 284 days 3 years    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 12.43 $ 12.17    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 4.93      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 2 years 146 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 362,123   $ 362,123  
Proceeds from Stock Options Exercised $ 2,580 $ 17    
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     15,107 17,312
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price     $ 11.23 $ 8.43
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 34,739   34,739  
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years      
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years      
Share-based Payment Arrangement, Option [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years      
Share-based Payment Arrangement, Option [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years      
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   8,625    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 11.86    
Restricted Stock [Member] | Non Employee Directors [Member] | Stock Compensation Plan 2007 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0 0    
Restricted Stock [Member] | Minimum [Member] | Employees [Member] | Stock Compensation Plan 2007 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year      
Restricted Stock [Member] | Maximum [Member] | Employees [Member] | Stock Compensation Plan 2007 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 10 years      
Performance Shares [Member] | Non Employee Directors [Member] | Stock Compensation Plan 2007 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 8,625      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 11.86      
Selling, General and Administrative Expenses [Member]        
Share-based Payment Arrangement, Expense $ 235,788 $ 507,284    
Cost of Sales [Member]        
Share-based Payment Arrangement, Expense $ 4,798 $ 31,240