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Note 3 - Earnings per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Mar. 21, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
 [2]
Jun. 30, 2023
Jun. 30, 2022
Net Income $ 8,414 $ 4,669   $ 6,417 $ 6,262 $ 5,176 $ 3,618 $ 3,105 $ 3,133   $ 25,762 $ 15,032
Weighted average shares outstanding during the period, net of treasury shares (in shares)                     27,159 26,618
Weighted average vested restricted stock units outstanding (in shares)                     895 638
Weighted average shares outstanding (in shares)                     28,127 27,286
Basic income per share (in dollars per share) $ 0.30   $ 0.16 $ 0.23 $ 0.23 $ 0.19 $ 0.13 $ 0.11 $ 0.12   $ 0.92 $ 0.55
Impact of common shares to be issued under stock option plans, and Contingently issuable shares, if any (in shares) [1]                     1,189 707
Weighted average shares outstanding (in shares)                     29,316 27,993
Diluted (in dollars per share) $ 0.28 $ 0.16   $ 0.22 $ 0.22   $ 0.13 [2] $ 0.11 [2] $ 0.11 [2] $ 0.18 $ 0.88 $ 0.54 [2]
Anti-dilutive securities (b) (in shares) [3]                     154 1,100
Restricted Stock Units (RSUs) [Member]                        
Weighted average vested restricted stock units outstanding (in shares)                     73 30
[1] Calculated using the “Treasury Stock” method as if dilutive securities were exercised and the funds were used to purchase common shares at the average market price during the period.
[2] The total of the earnings per share for each of the four quarters does not equal the total earnings per share for the full year because the calculations are based on the average shares outstanding during each of the individual periods. There is no difference between basic and diluted shares due to losses.
[3] Anti-dilutive securities were excluded in the computation of diluted earnings per share for the year ended June 30, 2023, and June 30, 2022, because the exercise price was greater than the fair market price of the common shares or because the assumed proceeds from the award’s exercise or vesting was greater than the average fair market price of the common shares.