Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2019
Income Tax Expense (Benefit), Total	$ 112	$ 1,584	$ 29	$ 4,548
Liability for Uncertainty in Income Taxes, Current	$ 0		0
Unrecognized Tax Benefits, Ending Balance					$ 0
Maximum [Member]
Income Tax Expense (Benefit), Total			$ 100