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Note 13 - Computation of Earnings per Share - Computation of Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 2,286	$ 6,622	$ 8,544	$ 15,944
Weighted average shares - basic (in shares)	31,487	31,585	31,626	31,488
Weighted average shares - diluted (in shares)	32,343	32,231	32,483	32,173
Net income per share - basic (in dollars per share)	$ 0.07	$ 0.21	$ 0.27	$ 0.51
Net income per share - diluted (in dollars per share)	$ 0.07	$ 0.21	$ 0.26	$ 0.50

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.