Note 12 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	2 Months Ended	12 Months Ended			36 Months Ended	71 Months Ended
	Oct. 30, 2015	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2012	Nov. 04, 2015	Feb. 01, 2007
Stock Repurchase Program 2007 [Member]
Treasury Stock, Shares, Acquired						0	756,100
Treasury Stock, Value, Acquired, Cost Method							$ 14,376
Common Stock [Member]
Conversion of Stock, Shares Converted				222,532
Restricted Stock [Member]
Shares Paid for Tax Withholding for Share Based Compensation			15,961	18,504	27,964
Employee Stock Option [Member]
Shares Paid for Tax Withholding for Share Based Compensation			5,718
Matrix Acquisition [Member]
Shares Paid for Tax Withholding for Share Based Compensation			43,743
Treasury Stock, Shares, Acquired	707,318	109,150
Common Stock, Shares Authorized		40,000,000	40,000,000	40,000,000		40,000,000
Common Stock, Par or Stated Value Per Share		$ 0.001	$ 0.001	$ 0.001		$ 0.001
Preferred Stock, Shares Authorized		10,000,000	10,000,000			10,000,000
Preferred Stock, Par or Stated Value Per Share		$ 0.001	$ 0.001			$ 0.001
Common Stock, Shares, Outstanding		17,186,780	17,186,780	16,870,285		17,186,780
Treasury Stock, Shares		1,895,998	1,895,998	1,014,108		1,895,998
Preferred Stock, Shares Outstanding		803,518	803,518	0		803,518
Treasury Stock, Shares Surrendered				39,162
Treasury Stock, Value, Acquired, Cost Method	$ 29,000	$ 5,111	$ 34,111
Treasury Stock Acquired, Average Cost Per Share	$ 41
Stock Repurchase Program, Authorized Amount								$ 70,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased									1,000,000