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Note 12 - Net (Loss) Income Per Share - Computation of Net Income Per Share, Basic & Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Net (loss) income available for shareholders	$ 4,254	$ (11,086)	$ 2,353	$ 1,517	$ 3,643	$ 3,252	$ 2,358	$ 1,930	$ 3,991	$ 2,597	$ 1,826	$ 2,755	$ (2,962)	$ 11,183	$ 11,169
Weighted average outstanding shares of common stock (in shares)													3,770	3,679	3,605
Dilutive effect of stock options (in shares)														165	152
Common stock and equivalents (in shares)													3,770	3,844	3,757
Basic (in dollars per share)	$ 1.12	$ (2.93)	$ 0.63	$ 0.41	$ 0.98	$ 0.88	$ 0.64	$ 0.53	$ 1.10	$ 0.72	$ 0.51	$ 0.77	$ (0.79)	$ 3.04	$ 3.10
Diluted (in dollars per share)													$ (0.79)	$ 2.91	$ 2.97

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

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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