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Note 7 - Changes in Shareholders' Equity - Schedule of Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Balance	$ 141,281
Net income	4,428	$ 7,768
Balance	140,347
Additional Paid-in Capital [Member]
Balance	7,111	3,804
Share based compensation	718	740
Dividends declared	0	0
Net income	0	0
Balance	7,829	4,544
Retained Earnings [Member]
Balance	134,141	126,177
Share based compensation	0	0
Dividends declared	(6,080)	(5,647)
Net income	4,428	7,768
Balance	$ 132,489	$ 128,298

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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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