Note 3 - Earnings 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, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2015	Jun. 30, 2014
BASIC EARNINGS (LOSS) PER SHARE
Net income		$ (2,664)	$ 220	$ (1,468)	$ (15,629)	$ 696	$ (531)	$ 2,006	$ 829	$ 1,428	$ 522	$ 3,782	$ 3,750	$ (19,541)		$ 3,000		$ 9,482		$ 5,151	$ 930
Weighted average shares outstanding during the period, net of treasury shares (a) (in shares)	[1]													25,569		25,144		24,720
Weighted average vested units and shares outstanding (in shares)														242		255		244
Weighted average shares outstanding (in shares)														25,866		25,436		24,988		24,496	24,388
Basic (loss) earnings per share (in dollars per share)		$ (0.10)	$ (0.01)	$ (0.06)	$ (0.61)	$ 0.03	$ (0.02)	$ 0.08	$ 0.03	$ 0.06	$ 0.02	$ 0.15	$ 0.15	$ (0.76)		$ 0.12		$ 0.38		$ 0.21	$ 0.04
DILUTED EARNINGS (LOSS) PER SHARE
Net income		$ (2,664)	$ 220	$ (1,468)	$ (15,629)	$ 696	$ (531)	$ 2,006	$ 829	$ 1,428	$ 522	$ 3,782	$ 3,750	$ (19,541)		$ 3,000		$ 9,482		$ 5,151	$ 930
Weighted average shares outstanding - Basic (in shares)														25,866		25,436		24,988		24,496	24,388
Impact of common shares to be issued under stock option plans, and contingently issuable shares, if any (in shares)	[2]															552		604
Weighted average shares outstanding (c) (in shares)														25,866	[3]	25,988	[3]	25,592	[3]	24,638	24,546
Diluted (loss) earnings per share (in dollars per share)		$ (0.10)	$ (0.01)	$ (0.06)	$ (0.61)	$ 0.03	$ (0.02)	$ 0.08	$ 0.03	$ 0.06	$ 0.02	$ 0.15	$ 0.15	$ (0.76)		$ 0.12		$ 0.37		$ 0.21	$ 0.04
Restricted Stock Units (RSUs) [Member]
BASIC EARNINGS (LOSS) PER SHARE
Weighted average vested units and shares outstanding (in shares)														55		37		24

[1] Includes shares accounted for like treasury stock.

[2] 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.

[3] Options to purchase 2,802,420 common shares, 1,698,883 common shares, and 1,331,300 common shares at June 30, 2018, 2017, and 2016, respectively, were not included in the computation of diluted earnings per share because the exercise price was greater than the average fair market value of the common shares. For the year ended June 30, 2018 the effect of dilutive securities was not included in the calculation of diluted earnings (loss) per share because there was a net operating loss for the period.