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Note 10 - Benefit Plans - Defined Benefit Plans Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Benefit obligation at beginning of year $ 15,654 $ 33,115
Service cost on benefits earned during the period   185
Interest cost on projected benefit obligation   508
Actuarial (gain) loss   778
Benefits paid   (230)
Lump sum benefits paid   (17,430)
Amendments   711
Effect of settlement/curtailment   (1,983)
Benefit obligation at end of year   15,654
Fair value of plan assets at beginning of year 546 18,754
Actual return on assets   (637)
Employer contributions   (89)
Employer contributions   89
Benefits paid   (230)
Lump sum benefits paid   (17,430)
Fair value of plan assets at end of year   546
Funded status at end of year   (15,108)
Other assets   415
Other current liabilities   (103)
Long-term pension liability   (15,420)
Net amount recognized   (15,108)
Net actuarial loss   6,698
Supplemental Employee Retirement Plan [Member]    
Benefit obligation at beginning of year 15,523 14,337
Service cost on benefits earned during the period 203 185
Interest cost on projected benefit obligation 401 337
Actuarial (gain) loss (3,031) 767
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 12,993 15,523
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
Funded status at end of year (12,993) (15,523)
Other assets 0 0
Other current liabilities (129) (103)
Long-term pension liability (12,864) (15,420)
Net amount recognized (12,993) (15,523)
Net actuarial loss 1,953 6,698
Pension Plan [Member]    
Benefit obligation at beginning of year 131 18,778
Service cost on benefits earned during the period   0
Interest cost on projected benefit obligation 0 171
Actuarial (gain) loss   11
Benefits paid   (127)
Lump sum benefits paid   (17,430)
Amendments   711
Effect of settlement/curtailment   (1,983)
Benefit obligation at end of year   131
Fair value of plan assets at beginning of year $ 546 18,754
Actual return on assets   (637)
Employer contributions   (14)
Employer contributions   14
Benefits paid   (127)
Lump sum benefits paid   (17,430)
Fair value of plan assets at end of year   546
Funded status at end of year   415
Other assets   415
Other current liabilities   0
Long-term pension liability   0
Net amount recognized   415
Net actuarial loss   $ 0