Note 10 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017	Dec. 31, 2016
Common Stock, Shares Authorized	160,000			160,000
Common Stock, Par or Stated Value Per Share	$ 0.0013			$ 0.0013
Preferred Stock, Shares Authorized	20,000			20,000
Preferred Stock, Par or Stated Value Per Share	$ 0.001			$ 0.001
Replacement Shelf Registration			$ 250,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 0	$ 0