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Note 7 - Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss Reported in the Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Balance $ 307,878 $ 293,132 $ 325,495
Reclassification of stranded income tax effects in accumulated other comprehensive income     0
Balance 315,513 307,878 293,132
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]      
Balance (8,155) (8,243) (5,321)
Reclassification of stranded income tax effects in accumulated other comprehensive income     0
Reclassification adjustments 0 0 0
Current period benefit (charge) 3,111 88 (2,922)
Income tax charge (benefit) 0 0 0
Current period benefit (charge) 3,111 88 (2,922)
Income tax charge (benefit) 0 0 0
Income tax charge (benefit) 0 (0) (0)
Balance (5,044) (8,155) (8,243)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Balance (20,382) (15,180) (7,188)
Reclassification of stranded income tax effects in accumulated other comprehensive income     (2,070)
Reclassification adjustments 7,049 1,753 4,016
Current period benefit (charge) (13,510) (8,521) (9,644)
Income tax charge (benefit) (1,510) 1,566 (294)
Current period benefit (charge) (13,510) (8,521) (9,644)
Income tax charge (benefit) (1,510) 1,566 (294)
Income tax charge (benefit) 1,510 (1,566) 294
Balance (25,333) (20,382) (15,180)
AOCI Attributable to Parent [Member]      
Balance (28,537) (23,423) (12,509)
Reclassification of stranded income tax effects in accumulated other comprehensive income     (2,070)
Reclassification adjustments 7,049 1,753 4,016
Current period benefit (charge) (10,399) (8,433) (12,566)
Income tax charge (benefit) (1,510) 1,566 (294)
Current period benefit (charge) (10,399) (8,433) (12,566)
Income tax charge (benefit) (1,510) 1,566 (294)
Income tax charge (benefit) 1,510 (1,566) 294
Balance $ (30,377) $ (28,537) $ (23,423)