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Note 12 - Computation of Earnings per Share - Computation of Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net income	$ 3,273	$ 5,747	$ 6,258	$ 9,322
Weighted average shares - basic (in shares)	31,651	31,499	31,769	31,439
Weighted average shares - diluted (in shares)	32,380	32,235	32,627	32,142
Net income per share - basic (in dollars per share)	$ 0.10	$ 0.18	$ 0.20	$ 0.30
Net income per share - diluted (in dollars per share)	$ 0.10	$ 0.18	$ 0.19	$ 0.29

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.