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Note 15 - 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, 2020
Dec. 31, 2019
Benefit obligation at beginning of year $ 36,050 $ 34,690
Service cost 5 4
Interest cost on projected benefit obligation 1,084 1,407
Actuarial loss 2,516 2,835
Benefits paid (2,796) (2,886)
Benefit obligation at end of year 36,859 36,050
Fair value of plan assets at beginning of year 31,738 30,199
Actual return on plan assets 2,549 4,043
Company contributions 862 382
Benefits paid (2,796) (2,886)
Fair value of plan assets at end of year 32,353 31,738
Underfunded status of the plans (4,506) (4,312)
Other assets 380 607
Accrued liabilities (596) (893)
Other liabilities (4,290) (4,026)
Net amount recognized (4,506) (4,312)
Projected benefit obligation 25,566 24,843
Accumulated benefit obligation 25,566 24,843
Fair value of plan assets $ 20,680 $ 19,924
Discount rate – projected benefit obligation 2.25% 3.15%
Discount rate – net periodic pension cost 3.15% 4.25%
Rate of compensation increase   4.00%
Weighted average asset allocation: 100.00% 100.00%
Equity Securities [Member]    
Weighted average asset allocation: 17.00% 18.00%
Debt Securities [Member]    
Weighted average asset allocation: 80.00% 78.00%
Other [Member]    
Weighted average asset allocation: 3.00% 4.00%
Minimum [Member]    
Expected long-term rate of return on plan assets 3.05% 3.65%
Maximum [Member]    
Expected long-term rate of return on plan assets 3.40% 3.90%