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Note 8 - Benefit Plans - Defined Benefit Plans Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Benefit obligation at beginning of year $ 33,115 $ 28,470  
Service cost - benefits earned during the period 185 152  
Interest cost on projected benefit obligation 508 863  
Actuarial loss 778 5,383  
Benefits paid (230) (1,753)  
Lump sum benefits paid (17,430) 0  
Amendments 711 0  
Effect of settlement/curtailment (1,983) 0  
Benefit obligation at end of year 15,654 33,115 $ 28,470
Fair value of plan assets at beginning of year 18,754 19,939  
Actual return on assets (637) 462  
Employer contributions (89) (103)  
Employer contributions 89 103  
Benefits paid (230) (1,750)  
Lump sum benefits paid (17,430) 0  
Fair value of plan assets at end of year 546 18,754 19,939
Funded status at end of year (15,108) (14,361)  
Other assets 415 314  
Other current liabilities (103) (101)  
Long-term pension liability (15,420) (14,574)  
Net amount recognized (15,108) (14,361)  
Net actuarial loss 6,698 15,656  
Pension Plan [Member]      
Benefit obligation at beginning of year 18,778 18,114  
Service cost - benefits earned during the period 0 0  
Interest cost on projected benefit obligation 171 541 721
Actuarial loss 11 1,773  
Benefits paid (127) (1,650)  
Lump sum benefits paid (17,430) 0  
Amendments 711 0  
Effect of settlement/curtailment (1,983) 0  
Benefit obligation at end of year 131 18,778 18,114
Fair value of plan assets at beginning of year 18,754 19,939  
Actual return on assets (637) 462  
Employer contributions (14) 0  
Employer contributions 14 0  
Benefits paid (127) (1,647)  
Lump sum benefits paid (17,430) 0  
Fair value of plan assets at end of year 546 18,754 19,939
Funded status at end of year 415 (24)  
Other assets 415 314  
Other current liabilities 0 0  
Long-term pension liability 0 (338)  
Net amount recognized 415 (24)  
Net actuarial loss 0 8,227  
Supplemental Employee Retirement Plan [Member]      
Benefit obligation at beginning of year 14,337 10,356  
Service cost - benefits earned during the period 185 152 117
Interest cost on projected benefit obligation 337 322 363
Actuarial loss 767 3,610  
Benefits paid (103) (103)  
Lump sum benefits paid 0 0  
Amendments 0 0  
Effect of settlement/curtailment 0 0  
Benefit obligation at end of year 15,523 14,337 10,356
Fair value of plan assets at beginning of year 0 0  
Actual return on assets 0 0  
Employer contributions (103) (103)  
Employer contributions 103 103  
Benefits paid (103) (103)  
Lump sum benefits paid 0 0  
Fair value of plan assets at end of year 0 0 $ 0
Funded status at end of year (15,523) (14,337)  
Other assets 0 0  
Other current liabilities (103) (101)  
Long-term pension liability (15,420) (14,236)  
Net amount recognized (15,523) (14,337)  
Net actuarial loss $ 6,698 $ 7,429