Note 13 - Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Balance		$ 208,743	$ 185,799
Other comprehensive income (loss)		1,829	(2,431)
Balance		215,356	186,323
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance		(14,911)
Other comprehensive (loss) income before reclassifications		(1,216)
Amount reclassified from accumulated other comprehensive loss		0
Other comprehensive income (loss)		(1,216)
Balance		(16,127)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance		(87)
Other comprehensive (loss) income before reclassifications		2,984
Amount reclassified from accumulated other comprehensive loss		0
Other comprehensive income (loss)		2,984
Balance		2,897
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance		(3,865)
Other comprehensive (loss) income before reclassifications		(6)
Amount reclassified from accumulated other comprehensive loss	[1]	67
Other comprehensive income (loss)		61
Balance		(3,804)
AOCI Attributable to Parent [Member]
Balance		(18,863)	(18,063)
Other comprehensive (loss) income before reclassifications		1,762
Amount reclassified from accumulated other comprehensive loss		67
Other comprehensive income (loss)		1,829
Balance		$ (17,034)	$ (20,494)

[1] This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP Plan. This expense is reflected in other (expense) income, net on the accompanying condensed consolidated statements of operations.