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Note 19 - Pension Plan - Net Periodic Pension Cost (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Gross employer service cost $ 766 $ 1,237
Plan participant contributions (185) (246)
Interest cost on service cost 15 22
Employer's service cost 596 1,013
Interest cost 424 744
Expected net return on plan assets (395) (689)
Other costs 113 171
Settlement gain (1,302)
Total employer's pension expense $ (564) $ 1,239