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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Discount rate 3.60% 4.14% 4.39%
Expected long-term rate of return on plan assets 6.19% 6.58% 6.62%
Rate of compensation increase [1]
[1] No compensation increase was assumed as the plan was frozen effective December 31, 2008.