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Note 7 - Changes in Shareholders' Equity - Schedule of Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Balance			$ 141,281				$ 141,281
Net income	$ 4,257			$ 7,611			15,034	$ 23,791
Balance	140,902						140,902
Additional Paid-in Capital [Member]
Balance	8,711	$ 7,829	7,111	5,317	$ 4,544	$ 3,804	7,111	3,804
Share based compensation	1,440	882	718	781	773	740
Dividends declared	0	0	0	0	0	0
Net income	0	0	0	0	0	0
Balance	10,151	8,711	7,829	6,098	5,317	4,544	10,151	6,098
Retained Earnings [Member]
Balance	132,746	132,489	134,141	131,063	128,298	126,177	134,141	126,177
Share based compensation	0	0	0	0	0	0
Dividends declared	(6,282)	(6,092)	(6,080)	(5,674)	(5,647)	(5,647)
Net income	4,257	6,349	4,428	7,611	8,412	7,768
Balance	$ 130,721	$ 132,746	$ 132,489	$ 133,000	$ 131,063	$ 128,298	$ 130,721	$ 133,000

X

- Definition

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

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