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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, 2019
Dec. 31, 2018
Benefit obligation at beginning of year $ 34,690 $ 39,179
Service cost 4 4
Interest cost on projected benefit obligation 1,407 1,315
Actuarial (gain) loss 2,835 (2,913)
Benefits paid (2,886) (2,895)
Benefit obligation at end of year 36,050 34,690
Fair value of plan assets at beginning of year 30,199 34,398
Actual return on plan assets 4,043 (1,381)
Company contributions 382 77
Benefits paid (2,886) (2,895)
Fair value of plan assets at end of year 31,738 30,199
Underfunded status of the plans (4,312) (4,491)
Other assets 607 138
Accrued liabilities (893) (357)
Other liabilities (4,026) (4,272)
Net amount recognized (4,312) (4,491)
Projected benefit obligation 24,843 23,466
Accumulated benefit obligation 24,843 23,466
Fair value of plan assets $ 19,924 $ 18,838
Discount rate – projected benefit obligation 3.15% 4.25%
Discount rate – net periodic pension cost 4.25% 3.55%
Rate of compensation increase 4.00% 4.00%
Expected long-term rate of return on plan assets 3.90%  
Weighted average asset allocation: 100.00% 100.00%
Equity Securities [Member]    
Weighted average asset allocation: 18.00% 16.00%
Debt Securities [Member]    
Weighted average asset allocation: 78.00% 80.00%
Other [Member]    
Weighted average asset allocation: 4.00% 4.00%
Minimum [Member]    
Expected long-term rate of return on plan assets 3.65% 4.30%
Maximum [Member]    
Expected long-term rate of return on plan assets   3.95%