Note 2 - Summary of Significant Accounting Policies (Details) - Basic and Diluted Net Income per Share Computational Data - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic and Diluted Net Income per Share Computational Data [Abstract]
Net income (in Dollars)		$ 7,155	$ 3,415	$ 1,316	$ 6,658
Basic shares outstanding:
Common stock		41,384	39,251	40,936	38,259
Dilutive securities (1)	[1]	1,774	2,396	2,045	2,638
Total		43,158	41,647	42,981	40,897

[1] For the three and nine months ended September 30, 2014, the Company's dilutive securities exclude options potentially exercisable in the future into 96,000 shares and 78,000 shares, respectively, because their inclusion would have been anti-dilutive. For the three and nine months ended September 30, 2015, the Company's dilutive securities exclude options potentially exercisable in the future into 49,000 shares and 34,000 shares, respectively, because their inclusion would have been anti-dilutive.