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Note 20 - Incentive Plans (Details) - Performance Shares Significant Fair Value Assumptions - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Note 20 - Incentive Plans (Details) - Performance Shares Significant Fair Value Assumptions [Line Items]      
Dividend yield (1)     3.85%
Risk-free rate     1.46%
Volatility     35.95%
Term of the award (years)     6 years 3 months
Performance Shares [Member]      
Note 20 - Incentive Plans (Details) - Performance Shares Significant Fair Value Assumptions [Line Items]      
Stock price (in Dollars per share) $ 26.83 $ 21.49 $ 21.54
Dividend yield (1) [1] 0.00% 0.00% 0.00%
Risk-free rate 0.98% 0.65% 0.14%
Volatility 16.81% 25.93% 16.90%
Term of the award (years)     321 days
[1] Total Shareholder Returns, as used in the performance share awards computation, are measured based on cumulative dividend stock prices, as such a zero percent dividend yield is utilized.