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Note 12 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Income Tax Expense (Benefit), Total $ (294) $ 3,008 $ (83) $ 2,964  
Liability for Uncertainty in Income Taxes, Current $ 0   $ 0    
Unrecognized Tax Benefits, Ending Balance         $ 0