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Note 8 - Employee Benefit Plans - Benefit Obligation and Prepaid Benefit Costs Assumptions (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Discount rate: net periodic pension cost   4.17%
Discount rate: projected benefit obligation   4.45%
Expected rate of return on plan assets 6.80% 7.20%
Rate of compensation increase   2.00%
Assumed for 2016 Through 2018 [Member]    
Rate of compensation increase 0.00% 0.00% [1]
Assumed for after 2018 [Member]    
Rate of compensation increase 2.00% 2.00% [1]
[1] 0% was assumed for years 2016 through 2018 and 2% was assumed thereafter.