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Note 18 - Stockholders' Equity (Details Textual) - shares
12 Months Ended
Dec. 20, 2016
Nov. 21, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Dividend Rate, Percentage   5.00%      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased     4,000,000    
Treasury Stock, Shares, Acquired     0 0 0
Treasury Stock, Shares     0    
Stock Dividend [Member]          
Dividends Payable, Date Declared   Nov. 21, 2016      
Dividends Payable, Date of Record Dec. 06, 2016