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Note 7 - Changes in Shareholders' Equity and Comprehensive Income - Schedule of Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Balance			$ 115,731
Net income	$ 10,752	$ 8,760	23,334	$ 18,036
Balance	129,841		129,841
Additional Paid-in Capital [Member]
Balance			9,381
Share based compensation			1,500
Dividends declared
Net income
Balance	10,881		10,881
Retained Earnings [Member]
Balance			106,320
Share based compensation
Dividends declared			(10,724)
Net income			23,334
Balance	$ 118,930		$ 118,930

X

- Definition

Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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