Note 4 - Earnings Per Common Share - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
BASIC EARNINGS PER SHARE
Net income (loss)		$ 1,861	$ (3,168)	$ 8,079	$ (17,201)
Weighted average shares outstanding during the period, net of treasury shares (in shares)	[1]	26,151	25,893	26,087	25,828
Weighted average vested restricted stock units outstanding (in shares)		144	206	156	215
Weighted average shares outstanding (in shares)		26,301	26,132	26,250	26,083
Basic income (loss) per share (in dollars per share)		$ 0.07	$ (0.12)	$ 0.31	$ (0.66)
Basic (in shares)		26,301	26,132	26,250	26,083
Impact of common shares to be issued under stock option plans, and contingently issuable shares, if any (in shares)	[1]	322		173
Weighted average shares outstanding (in shares)	[1]	26,623	26,132	26,423	26,083
Diluted income (loss) per share (in dollars per share)		$ 0.07	$ (0.12)	$ 0.31	$ (0.66)
Anti-dilutive securities (b) (in shares)	[2]	1,875	3,788	2,038	3,702
Restricted Stock Units (RSUs) [Member]
BASIC EARNINGS PER SHARE
Weighted average vested restricted stock units outstanding (in shares)		6	33	7	40

[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, 2020 because the exercise price was greater than the average fair market price of the common shares or because the assumed proceeds from the awards exercise or vesting was greater than the average fair market price of the common shares. For the three and nine months ended March 31, 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.