Note 18 - Stock Repurchase Program (Details Textual) - February 2016 Repurchase Program [Member] - USD ($) $ / shares in Thousands, $ in Millions	Feb. 01, 2016	Sep. 30, 2017	Dec. 31, 2016
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	45,000,000
Treasury Stock, Shares, Acquired	1,380,578
Treasury Stock, Value, Acquired, Cost Method	$ 37.5
Treasury Stock Acquired, Average Cost Per Share	$ 27,130
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased		7,500,000	7,500,000