Note 16 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Tax Expense (Benefit)	$ 2,044,000	$ 3,888,000	$ 7,156,000	$ 8,055,000
Effective Income Tax Rate Reconciliation, Percent	28.60%	63.00%	37.30%	48.50%
Tax Adjustments, Settlements, and Unusual Provisions		$ 1,400,000		$ 1,400,000
Reversal of Overstated Deferred Tax Asset [Member]
Tax Adjustments, Settlements, and Unusual Provisions		2,300,000		2,300,000
Reduction in Tax Reserves that was Overstated [Member]
Tax Adjustments, Settlements, and Unusual Provisions		$ (893,000)		$ (893,000)