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Note 8 - Employee Benefit Plans - Defined Benefit Plan Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair value of plan assets at beginning of year $ 25,007    
Fair value of plan assets at end of year 32,415 $ 25,007  
Pension Plan [Member]      
Projected benefit obligation at beginning of year 29,641 23,688 $ 23,492
Service cost (1) [1] 1,080 801 868
Interest cost 820 884 802
Actuarial loss (gain) 4,621 5,162 (423)
Benefits paid (1,310) (894) (1,051)
Projected benefit obligation at end of year 34,852 29,641 23,688
Fair value of plan assets at beginning of year 25,007 21,786 23,428
Actual return on plan assets 3,718 4,115 (591)
Employer contribution 5,000    
Benefits paid (1,310) (894) (1,051)
Fair value of plan assets at end of year 32,415 25,007 21,786
Funded status at the end of the year (2,437) (4,634) (1,902)
Deferred tax asset 512 973 399
Other liabilities (2,437) (4,634) (1,902)
Total amounts recognized in the Consolidated Balance Sheet (1,925) (3,661) (1,503)
Net loss (12,855) (10,983) (9,107)
Prior service cost 11 120 230
Deferred tax asset 2,697 2,281 1,864
Amount recognized (10,147) (8,582) (7,013)
Benefit obligation (34,852) (29,641) (23,688)
Fair value of assets 32,415 25,007 21,789
Unrecognized net actuarial loss 12,855 10,983 9,107
Unrecognized prior service cost (11) (120) (230)
Deferred tax liability (2,185) (1,308) (1,465)
Prepaid benefit cost included in other assets 8,222 4,921 5,510
Expected return on plan assets (1,679) (1,461) (1,601)
Amortization of prior service cost (110) (110) (110)
Recognized net actuarial loss 710 632 585
Net periodic benefit cost 821 746 544
Net loss 1,871 1,876 1,184
Amortization of prior service cost 110 110 110
Deferred income tax benefit (416) (417) (272)
Total recognized 1,565 1,569 1,022
Total recognized in net periodic benefit cost and other comprehensive income $ 2,802 $ 2,732 $ 1,838
Discount rate used for net periodic pension cost 3.00% 4.00% 3.50%
Discount rate used for disclosure 2.25% 3.00% 4.00%
Expected return on plan assets 7.50% 7.50% 7.50%
Rate of compensation increase 3.00% 3.00% 3.00%
[1] Cost is included in Salaries and Employee Benefits expense.