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Note 17 - Stock-based Compensation (Details) - Cash Proceeds, Tax Benefits and Intrinsic Value Related to Stock Options - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash Proceeds, Tax Benefits and Intrinsic Value Related to Stock Options [Abstract]      
Proceeds from stock options exercised $ 5,176 $ 2,313 $ 1,984
Tax benefits realized from stock compensation 2,984 978 410
Intrinsic value of stock options exercised $ 11,042 $ 3,184 $ 3,060