Annual report pursuant to Section 13 and 15(d)

Note 5 - Employee Benefit Plans - Summary of Weighted-average Assumptions Used to Determine Benefit Obligations and Costs (Details)

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Note 5 - Employee Benefit Plans - Summary of Weighted-average Assumptions Used to Determine Benefit Obligations and Costs (Details)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Weighted average assumptions used to determine benefit obligations as of December 31:      
Discount rate 3.75% 4.25% 4.50%
Rate of compensation increase 7.29% 7.29% 7.29%
Weighted average assumptions used to determine benefit costs for the years ended December 31:      
Discount rate 4.25% 4.50% 4.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 7.00% 7.00% 7.00%
Rate of compensation increase 7.29% 7.29% 7.29%