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Note 8 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Loss Reported in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Balance	$ 307,878	$ 293,132
Balance	319,631	310,312
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(8,155)	(8,243)
Reclassification adjustments	0	0
Current period benefit (charge)	397	(1,180)
Income tax benefit (charge)	0	0
Balance	(7,758)	(9,423)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(20,382)	(15,180)
Reclassification adjustments	6,276	1,315
Current period benefit (charge)	0	0
Income tax benefit (charge)	(1,443)	(281)
Balance	(15,549)	(14,146)
AOCI Attributable to Parent [Member]
Balance	(28,537)	(23,423)
Reclassification adjustments	6,276	1,315
Current period benefit (charge)	397	(1,180)
Income tax benefit (charge)	(1,443)	(281)
Balance	$ (23,307)	$ (23,569)

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Amount of current period charge (benefit) before tax of other comprehensive income (loss) attributable to parent entity.

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