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Note 14 - Benefit Plans - Weighted-average Assumptions Used to Determine Net Periodic Pension (Benefit) Cost (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Discount rate 4.39% 3.99% 5.01%
Expected long-term rate of return on plan assets 6.62% 6.75% 6.88%
Rate of compensation increase (1) [1]
[1] No compensation increase was assumed as the plans were frozen effective December 31, 2008.