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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Balance     $ 130,010       $ 130,010  
Net income $ 7,611     $ 6,840     23,791 $ 18,848
Repurchase and retirement of common stock               (11,500)
Balance 139,127           139,127  
Additional Paid-in Capital [Member]                
Balance 5,317 $ 4,544 3,804 2,347 $ 1,617 $ 12,478 3,804 12,478
Share based compensation 781 773 740 716 730 635    
Dividends declared 0 0 0 0 0 0    
Net income 0 0 0 0 0 0    
Repurchase and retirement of common stock           (11,496)    
Balance 6,098 5,317 4,544 3,063 2,347 1,617 6,098 3,063
Retained Earnings [Member]                
Balance 131,063 128,298 126,177 123,215 121,997 122,172 126,177 122,172
Share based compensation 0 0 0 0 0 0    
Dividends declared (5,674) (5,647) (5,647) (5,437) (5,447) (5,518)    
Net income 7,611 8,412 7,768 6,840 6,665 5,343    
Repurchase and retirement of common stock           0    
Balance $ 133,000 $ 131,063 $ 128,298 $ 124,618 $ 123,215 $ 121,997 $ 133,000 $ 124,618