Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit), Total	$ 2,389	$ 2,860	$ 9,394	$ 12,204
Effective Income Tax Rate Reconciliation, Percent, Total	23.50%	24.00%	23.20%	31.10%