Note 18 - Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Balance		$ 168,051	$ 176,470
Other comprehensive income:		6,002	1,236
Balance		185,799	168,051
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance		(20,032)	(22,635)
Other comprehensive income (loss) before reclassifications		6,890	2,603
Amounts reclassified from accumulated other comprehensive income (loss)		0	0
Effect of adoption of ASU 2018-02 (Topic 220)			0
Other comprehensive income:		6,890	2,603
Balance		(13,142)	(20,032)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance		12	12
Other comprehensive income (loss) before reclassifications		7	0
Amounts reclassified from accumulated other comprehensive income (loss)		0	0
Effect of adoption of ASU 2018-02 (Topic 220)			0
Other comprehensive income:		7	0
Balance		19	12
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance		(4,045)	(2,215)
Other comprehensive income (loss) before reclassifications		(933)	(1,492)
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	38	125
Effect of adoption of ASU 2018-02 (Topic 220)			(463)
Other comprehensive income:		(895)	(1,830)
Balance		(4,940)	(4,045)
AOCI Attributable to Parent [Member]
Balance		(24,065)	(24,838)
Other comprehensive income (loss) before reclassifications		5,964	1,111
Amounts reclassified from accumulated other comprehensive income (loss)		38	125
Effect of adoption of ASU 2018-02 (Topic 220)			(463)
Other comprehensive income:		6,002	773
Balance		$ (18,063)	$ (24,065)

[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 consolidated statement of operations.