Note 3 - Earnings (Loss) Per Common 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, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019
BASIC EARNINGS (LOSS) PER SHARE
Net income (loss)		$ 1,513	$ 1,861	$ 1,743	$ 4,475	$ 862	$ (3,168)	$ (15,782)	$ 1,749	$ 9,592	$ (16,339)
Weighted average shares outstanding during the period, net of treasury shares (in shares)	[1]									26,105	25,858
Weighted average vested restricted stock units outstanding (in shares)										162	215
Weighted average shares outstanding (in shares)										26,274	26,109
Basic income (loss) per share (in dollars per share)		$ 0.06	$ 0.07	$ 0.07	$ 0.17	$ 0.03	$ (0.12)	$ (0.61)	$ 0.07	$ 0.37	$ (0.63)
Basic (in shares)										26,274	26,109
Impact of common shares to be issued under stock option plans, and contingently issuable shares, if any (in shares)	[1]									199
Weighted average shares outstanding (in shares)	[1]									26,473	26,109
Diluted income (loss) per share (in dollars per share)		$ 0.06	$ 0.07	$ 0.07	$ 0.17	$ 0.03	$ (0.12)	$ (0.61)	$ 0.07	$ 0.36	$ (0.63)
Anti-dilutive securities (b) (in shares)	[2]									1,957	3,556
Restricted Stock Units (RSUs) [Member]
BASIC EARNINGS (LOSS) PER SHARE
Weighted average vested restricted stock units outstanding (in shares)										7	36

[1] Calculative 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 in the computation of diluted earnings per share for the year ended June 30, 2020 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. For the year ended June 30, 2019, the effect of dilutive securities was not included in the calculation of diluted loss per share because there was a net loss for the period.