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Note 6 - Defined Benefit Plan - Defined Benefit Plan Activity (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Service cost $ 540 $ 400
Interest cost 410 442
Expected return on plan assets (840) (730)
Amortization of prior service cost (54) (54)
Recognized net actuarial loss 354 316
Net periodic benefit cost 410 374
Pension Plan [Member]    
Service cost 270 200
Interest cost 205 221
Expected return on plan assets (420) (365)
Amortization of prior service cost (27) (27)
Recognized net actuarial loss 177 158
Net periodic benefit cost $ 205 $ 187