Note 3 - Summary of Significant Accounting Policies - Basic and Diluted Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net (loss) income	$ (17,489)	$ 12,106	$ (425)	$ 27,750
Weighted average shares outstanding used in calculating basic earnings per share (in shares)	12,833	13,771	12,888	14,299
Dilutive common share equivalents (in shares)		112		94
Weighted average common and common share equivalents used in calculating diluted earnings per share (in shares)	12,833	13,883	12,888	14,393
(Loss) income per common share:
Basic (in dollars per share)	$ (1.36)	$ 0.88	$ (0.03)	$ 1.94
Diluted (in dollars per share)	$ (1.36)	$ 0.87	$ (0.03)	$ 1.93
Options and restricted share units outstanding which are not included in the calculation of diluted earnings per share because their impact is anti-dilutive (in shares)	460	123	460	78