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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
	Jun. 30, 2019	Jun. 30, 2018
Balance	$ 134,680
Repurchase and retirement of common stock	(11,500)
Net income	5,343	$ 12,582
Balance	123,643
Additional Paid-in Capital [Member]
Balance	12,478	9,381
Share based compensation	635	719
Dividends declared
Repurchase and retirement of common stock	(11,496)
Net income
Balance	1,617	10,100
Retained Earnings [Member]
Balance	122,172	106,320
Share based compensation
Dividends declared	(5,518)	(5,151)
Repurchase and retirement of common stock
Net income	5,343	12,582
Balance	$ 121,997	$ 113,751

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Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.

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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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