XML 67 R43.htm IDEA: XBRL DOCUMENT v3.20.1
Note 7 - Net Income Per Share - Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Net income (numerator):                      
Net income $ 7,003 $ 6,840 $ 6,665 $ 5,343 $ 6,620 $ 7,787 $ 10,752 $ 12,582 $ 25,851 $ 37,740 $ 37,283
Shares (denominator)                      
Weighted average number of common shares outstanding used in basic computation (in shares)                 20,041 20,461 20,346
Common shares issuable upon the vesting of restricted stock (in shares)                 4 20 77
Common shares issuable upon conversion of preferred shares (in shares)                 10 10 10
Shares used in diluted computation (in shares)                 20,055 20,491 20,433
Net income per common share                      
Basic (in dollars per share)                 $ 1.29 $ 1.84 $ 1.83
Diluted (in dollars per share) $ 0.35 $ 0.34 $ 0.33 $ 0.26 $ 0.32 $ 0.38 $ 0.52 $ 0.62 $ 1.29 $ 1.84 $ 1.82