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
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
BASIC EARNINGS (LOSS) PER SHARE
Net (loss) income		$ (15,629)	$ 829	$ (15,629)	$ 829
Weighted average shares outstanding, net of treasury shares (a) (in shares)	[1]	25,505	24,998
Weighted average vested units and shares outstanding (in shares)		245	240
Weighted average shares outstanding (in shares)		25,791	25,275
Basic earnings (loss) per share (in dollars per share)		$ (0.61)	$ 0.03
DILUTED EARNINGS (LOSS) PER SHARE
Net (loss) income		$ (15,629)	$ 829	$ (15,629)	$ 829
Basic (in shares)		25,791	25,275
Impact of common shares to be issued under stock option plans, and contingently issuable shares, if any (in shares)	[2]		637
Weighted average shares outstanding (c) (in shares)	[3]	25,791	25,912
Diluted earnings (loss) per share (in dollars per share)		$ (0.61)	$ 0.03
Restricted Stock Units (RSUs) [Member]
BASIC EARNINGS (LOSS) PER SHARE
Weighted average vested units and shares outstanding (in shares)		41	37

[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 3,671,340 common shares and 1,654,450 common shares at September 30, 2017 and 2016, respectively, were not included in the computation of the three month period for diluted earnings per share, respectively, because the exercise price was greater than the average fair market value of the common shares. For the three months ended September 30, 2017, the effect of dilutive securities was not included in the calculation of diluted earnings per share because there was a net operating loss for the period.