Note 17 - Industry Segment Information - Net Sales and Income (Loss) by Industry Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Net sales	$ 156,283	$ 153,697	$ 307,569	$ 309,669
Income from operations	16,738	17,639	31,092	33,491
Restructuring costs	(509)	(720)	(1,996)	(2,199)
Acquisition-related costs	(570)	(773)	(596)	(1,507)
Interest expense	1,601	1,928	3,086	4,050
Other non-operating (income) expense	(60)	588	(231)	(331)
Income from continuing operations before income taxes	15,197	15,123	28,237	29,772
Electronics Products Group [Member]
Net sales	60,156	45,834	115,427	92,452
Income from operations	9,962	7,776	18,497	15,875
Restructuring costs	(82)	(59)	(256)	(59)
Engraving Group [Member]
Net sales	37,950	38,256	74,351	76,687
Income from operations	6,501	6,916	12,374	13,454
Restructuring costs	(391)	(438)	(628)	(1,477)
Scientific Group [Member]
Net sales	17,893	15,414	34,556	30,164
Income from operations	4,234	4,056	8,310	7,761
Engineering Technologies Group [Member]
Net sales	17,507	26,495	35,140	51,139
Income from operations	1,363	3,422	1,831	6,781
Restructuring costs	(2)	0	(37)	0
Specialty Solutions Group [Member]
Net sales	22,777	27,698	48,095	59,227
Income from operations	3,211	4,341	7,117	9,990
Restructuring costs	(4)	(150)	(959)	(241)
Corporate and Other [Member]
Income from operations	$ (7,454)	$ (7,379)	$ (14,445)	$ (16,664)