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Note 15 - Pension Plan - Net Periodic Pension Cost (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Gross employer service cost $ 1,237 $ 1,501
Plan participant contributions (246) (308)
Interest cost on service cost 22 27
Employer's service cost 1,013 1,220
Interest cost 744 701
Expected net return on plan assets (689) (640)
Other costs 171 166
Total employer's pension expense $ 1,239 $ 1,447