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Note 8 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 12, 2020
Sep. 30, 2020
Sep. 30, 2019
Stock Issued During Period, Shares, New Issues (in shares) 600,000    
Sale of Stock, Underwriter Options, Shares (in shares) 90,000    
Shares Issued, Price Per Share (in dollars per share) $ 225.00    
Proceeds from Issuance of Common Stock $ 145,935 $ 0 $ 167,070