Note 7 - Changes in Shareholders' Equity - Schedule of Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Balance	$ 142,186
Net income	2,775	$ 4,428
Balance	140,200
Additional Paid-in Capital [Member]
Balance	11,660	7,111
Share based compensation	1,536	718
Dividends declared	0	0
Net income	0	0
Balance	13,196	7,829
Retained Earnings [Member]
Balance	130,496	134,141
Share based compensation	0	0
Dividends declared	(6,297)	(6,080)
Net income	2,775	4,428
Balance	$ 126,974	$ 132,489