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Note 7 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Loss Reported in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Balances | $ 331,194 | $ 329,976 | $ 315,513
Balance at December 31, 2020 | 349,459 | 331,194 | 329,976
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |
Balances | (10,619) | (7,851) | (5,044)
Reclassification adjustments | 0 | 0 | 0
Current period benefit (charge) | (931) | 2,768 | (2,807)
Income tax benefit | 0 | 0 | 0
Balance at December 31, 2020 | (9,688) | (10,619) | (7,851)
Reclassification adjustments | 0 | 0 | (0)
Current period benefit (charge) | 931 | (2,768) | 2,807
Income tax charge | 0 | 0 | (0)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Balances | (13,238) | (22,479) | (25,333)
Reclassification adjustments | (1,423) | (8,519) | 4,788
Current period benefit (charge) | 2,667 | (3,610) | (1,045)
Income tax benefit | (302) | 2,888 | (889)
Balance at December 31, 2020 | (14,180) | (13,238) | (22,479)
Reclassification adjustments | 1,423 | 8,519 | (4,788)
Current period benefit (charge) | (2,667) | 3,610 | 1,045
Income tax charge | 302 | (2,888) | 889
AOCI Attributable to Parent [Member] |  |  |
Balances | (24,474) | (30,330) | (30,377)
Reclassification adjustments | 207 | (8,476) | 4,788
Current period benefit (charge) | 697 | (76) | (3,852)
Income tax benefit | (441) | 2,696 | (889)
Balance at December 31, 2020 | (24,937) | (24,474) | (30,330)
Reclassification adjustments | (207) | 8,476 | (4,788)
Current period benefit (charge) | (697) | 76 | 3,852
Income tax charge | 441 | $ (2,696) | $ 889
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |
Reclassification adjustments | 1,630 |  |
Current period benefit (charge) | (1,039) |  |
Income tax benefit | (139) |  |
Balance at December 31, 2020 | (1,069) |  |
Reclassification adjustments | (1,630) |  |
Current period benefit (charge) | 1,039 |  |
Income tax charge | $ 139 |  |

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