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Note 7 - Changes in Shareholders' Equity - Schedule of Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		$ 142,186			$ 142,186
Shares Issued			$ 1
Net income	$ 2,579		6,349		5,354	$ 10,777
Ending balance	138,153				138,153
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	21	21	20	$ 20	21	20
Ending balance	21	21	21	20	21	21
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	13,196	11,660	7,829	7,111	11,660	7,111
Share based compensation	1,681	1,536	882	718
Ending balance	14,877	13,196	8,711	7,829	14,877	8,711
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	126,974	130,496	132,489	134,141	130,496	134,141
Dividends declared	(6,307)	(6,297)	(6,092)	(6,080)
Net income	2,579	2,775	6,349	4,428
Ending balance	$ 123,246	$ 126,974	$ 132,746	$ 132,489	$ 123,246	$ 132,746

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