Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock Based Compensation (Details Textual)

v3.8.0.1
Note 4 - Stock Based Compensation (Details Textual) - USD ($)
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Allocated Share-based Compensation Expense $ 483,287 $ 593,746
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 4,431,952  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 6 years 292 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 2 years 182 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 334,810  
Proceeds from Stock Options Exercised $ 3,249 $ 17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 3,500 10,000
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 14,242 11,144
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price $ 10.41 $ 15.21
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 103,013  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period  
Restricted Stock [Member] | Employees [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] | Employee and Non-Employee Directors [Member] | Stock Compensation Plan 2007 [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year  
Restricted Stock [Member] | Employee and Non-Employee Directors [Member] | Stock Compensation Plan 2007 [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 10 years  
Selling, General and Administrative Expenses [Member]    
Allocated Share-based Compensation Expense $ 441,257 $ 539,046
Cost of Sales [Member]    
Allocated Share-based Compensation Expense $ 42,030 $ 54,700