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Note 3 - Fair Value Measurements (Details Textual) - USD ($)
9 Months Ended
Aug. 12, 2019
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Money Market Funds, at Carrying Value   $ 57,108   $ 0
Proceeds from Convertible Debt   167,070,000  
Senior Notes [Member] | The Notes [Member]        
Proceeds from Convertible Debt $ 172,500,000 $ 172,500,000    
Debt Instrument, Interest Rate, Stated Percentage 1.375% 1.375%