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Note 16 - Pension Plan - Net Periodic Pension Cost (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Gross employer service cost $ 1,501 $ 1,378
Plan participant contributions (308) (336)
Interest cost on service cost 27 34
Employer's service cost 1,220 1,076
Interest cost 701 794
Expected net return on plan assets (640) (787)
Other costs 166 168
Total employer's pension expense $ 1,447 $ 1,251