Note 4 - 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, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2022	Jun. 30, 2021
Net income		$ 5,176	$ 3,618	$ 3,105	$ 3,133	$ 198	$ 1,472	$ 2,208	$ 1,990	$ 15,032	$ 5,868
Weighted average shares outstanding during the period, net of treasury shares (in shares)										26,618	26,411
Weighted average vested restricted stock units outstanding (in shares)										638	264
Weighted average shares outstanding (in shares)										27,286	26,692
Basic income per share (in dollars per share)		$ 0.19	$ 0.13	$ 0.11	$ 0.12	$ 0.01	$ 0.05	$ 0.08	$ 0.08	$ 0.55	$ 0.22
Basic (in shares)										27,286	26,692
Impact of common shares to be issued under stock option plans, and Contingently issuable shares, if any (in shares)	[1]									707	748
Weighted average shares outstanding (in shares)										27,993	27,440
Diluted income per share (in dollars per share)		$ 0.18	$ 0.13	$ 0.11	$ 0.11	$ 0.01	$ 0.05	$ 0.08	$ 0.07	$ 0.54	$ 0.21
Anti-dilutive securities (b) (in shares)	[2]									1,100	976
Restricted Stock Units (RSUs) [Member]
Weighted average vested restricted stock units outstanding (in shares)										30	17

[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] Anti-dilutive securities were excluded from the computation of diluted net income per share for the three and nine months ended March 31, 2022 and March 31, 2021 because the exercise price was greater than the average 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.