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Note 11 - Stock-based Compensation (Details Textual) - USD ($)
1 Months Ended 6 Months Ended
Oct. 31, 2018
Mar. 31, 2018
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     330,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 94,999
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     330,000
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 and Officer [Member]      
Stock Issued During Period, Shares, Restricted Stock Award, Gross 55,147 80,150  
Restricted Stock, Vesting Percentage Per Year 20.00%    
Restricted Stock Holding Period 1 year    
Fair Value Of Restricted Shares Upon Issuance $ 105,000    
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     157,154