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Note 3 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Aug. 12, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Money Market Funds, at Carrying Value   $ 235,989 $ 235,989   $ 0
Proceeds from Convertible Debt     167,070,000  
Fair Value, Inputs, Level 3 [Member]          
Assets, Fair Value Disclosure   0 0    
Nonfinancial Liabilities Fair Value Disclosure, Total   0 $ 0    
Senior Notes [Member] | The Notes [Member]          
Proceeds from Convertible Debt $ 172,500,000 $ 172,500,000