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Note 14 - Employee Benefit Plans - Summaries of Changes in Benefit Obligations and Plan Assets and of Funded Status of Pension Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Benefit obligation at beginning of year $ 36,859 $ 36,050
Service cost 4 5
Interest cost on projected benefit obligation 774 1,084
Actuarial loss (2,245) 2,516
Benefits paid (2,636) (2,796)
Benefit obligation at end of year 32,756 36,859
Fair value of plan assets at beginning of year 32,353 31,738
Actual return on plan assets 37 2,549
Company contributions 297 862
Fair value of plan assets at end of year 30,051 32,353
Underfunded status of the plans (2,705) (4,506)
Other assets 595 380
Accrued liabilities (126) (596)
Other liabilities (3,174) (4,290)
Net amount recognized (2,705) (4,506)
Projected benefit obligation 22,846 25,566
Accumulated benefit obligation 22,846 25,566
Fair value of plan assets $ 19,545 $ 20,680
Discount rate – projected benefit obligation 2.70% 2.25%
Discount rate – net periodic pension cost 2.25% 3.15%
Weighted average asset allocation: 100.00%  
Minimum [Member]    
Expected long-term rate of return on plan assets 1.80% 3.05%
Maximum [Member]    
Expected long-term rate of return on plan assets 2.95% 3.40%
Equity Securities [Member]    
Weighted average asset allocation: 16.00%  
Debt Securities [Member]    
Weighted average asset allocation: 81.00%  
Other [Member]    
Weighted average asset allocation: 3.00%