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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	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Balance	$ 307,878	$ 293,132
Balance	313,324	305,349
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(8,155)	(8,243)
Reclassification adjustments	0	0
Current period benefit (charge)	(1,247)	431
Income tax benefit (charge)	0	0
Balance	(9,402)	(7,812)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(20,382)	(15,180)
Reclassification adjustments	4,669	877
Current period benefit (charge)	0	0
Income tax benefit (charge)	(1,078)	(183)
Balance	(16,791)	(14,486)
AOCI Attributable to Parent [Member]
Balance	(28,537)	(23,423)
Reclassification adjustments	4,669	877
Current period benefit (charge)	(1,247)	431
Income tax benefit (charge)	(1,078)	(183)
Balance	$ (26,193)	$ (22,298)

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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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