Note 6 - Goodwill and Other Intangible Assets - Carrying Value of Goodwill by Reportable Segments (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill					$ 76,000
Accumulated impairment losses			$ (64,000)		(64,000)
Goodwill reallocation					0
Impairment	$ 0	$ 0	0	$ 0
Goodwill			12,000	12,000	12,000
Goodwill, gross			76,000
Traditional Printing [Member]
Goodwill					56,000
Accumulated impairment losses			(56,000)		(56,000)
Goodwill reallocation					0
Impairment			0	0
Goodwill			0	0	0
Goodwill, gross			56,000
Digital Printing [Member]
Goodwill					6,000
Accumulated impairment losses			0		0
Goodwill reallocation					0
Impairment			0	0
Goodwill			6,000	6,000	6,000
Goodwill, gross			6,000
Advanced Materials And Chemicals [Member]
Goodwill					14,000
Accumulated impairment losses			(8,000)		(8,000)
Goodwill reallocation					(6,000)
Impairment			0	0
Goodwill			0	0	0
Goodwill, gross			8,000
Brand [Member]
Goodwill					0
Accumulated impairment losses			0		0
Goodwill reallocation					6,000
Impairment			0	0
Goodwill			6,000	$ 6,000	$ 6,000
Goodwill, gross			$ 6,000