Note 3 - Summary of Significant Accounting Policies (Details) - Basic and Diluted Earnings Per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic and Diluted Earnings Per Share [Abstract]
Net income (in Dollars)	$ 8,283	$ 12,292	$ 15,644	$ 25,032
Weighted average shares outstanding used in calculating basic earnings per share	14,454	14,635	14,567	14,641
Dilutive common share equivalents	84	173	86	142
Weighted average common and common share equivalents used in calculating diluted earnings per share	14,538	14,808	14,653	14,783
Basic (in Dollars per share)	$ 0.57	$ 0.84	$ 1.07	$ 1.71
Diluted (in Dollars per share)	$ 0.57	$ 0.83	$ 1.07	$ 1.69
Options and restricted share units outstanding which are not included in the calculation of diluted earnings per share because their impact is anti-dilutive	182	2	158	4