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Note 6 - Changes in Shareholders' Equity and Comprehensive Income: - Schedule of Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Balance		$ 134,680			$ 134,680
Repurchase and retirement of common stock					(11,500)
Net income	$ 6,665		$ 10,752		12,008	$ 23,334
Balance	125,591				125,591
Additional Paid-in Capital [Member]
Balance	1,617	12,478	10,100	$ 9,381	12,478	9,381
Share based compensation	730	635	781	719
Dividends declared
Repurchase and retirement of common stock		(11,496)
Net income
Balance	2,347	1,617	10,881	10,100	2,347	10,881
Retained Earnings [Member]
Balance	121,997	122,172	113,751	106,320	122,172	106,320
Share based compensation
Dividends declared	(5,447)	(5,518)	(5,573)	(5,151)
Repurchase and retirement of common stock
Net income	6,665	5,343	10,752	12,582
Balance	$ 123,215	$ 121,997	$ 118,930	$ 113,751	$ 123,215	$ 118,930

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