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Note 11 - Stock-based Compensation (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       480,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 73,643    
Share-based Payment Arrangement, Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate        
Nonqualified Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       480,000 0 140,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate       0.00%    
Employees [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years    
Employees [Member] | Share-based Payment Arrangement, Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years    
Employees [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       5 years    
Board Of Directors [Member] | Share-based Payment Arrangement, Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years    
Board of Directors Chairman [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 55,147 80,150 58,009      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value $ 75,000       $ 105,000 $ 105,000
Board of Directors Chairman [Member] | Restricted Stock [Member] | Vest 20% Per Year [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%          
The 2015 Incentive Stock Plan [Member]            
Common Stock, Capital Shares Reserved for Future Issuance       1,100,415    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       7,154