Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Expense (Benefit)	$ 1,070	$ 2,860	$ 2,817	$ 5,112
Effective Income Tax Rate Reconciliation, Percent	23.60%	42.10%	23.90%	42.40%