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Note 8 - Retirement Plans - Estimated Rate of Increase in Compensation Levels (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Weighted-average assumptions used to determine net periodic benefit cost for the Gray pension plan:    
Discount rate 4.31% 4.00%
Expected long-term rate of return on pension plan assets 7.00% 7.00%
Estimated rate of increase in compensation levels   5.63%
Weighted-average assumptions used to determine benefit obligations:    
Discount rate 4.11% 4.31%