Note 17 - Operating Segment Information - Information Related to the Operations of the Company's Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	[1]	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net sales	$ 108,413	$ 89,466	$ 92,270	$ 86,552	$ 95,001	$ 95,870	$ 82,392		$ 73,087	$ 376,701	$ 346,350	$ 266,814
Cost of goods sold										247,772	224,653	170,462
Gross margin	34,867	$ 31,451	$ 32,343	$ 30,268	33,744	$ 33,800	$ 29,278		$ 24,875	128,929	121,697	96,352
Selling, General and Administrative Expense, Total										107,282	96,710	70,592
Other periodic pension cost										1,962	385	1,224
Interest expense										4,399	3,207	802
Income before taxes on income										15,286	21,395	24,782
Depreciation and amortization										8,272	7,906	5,653
Capital expenditures										9,672	4,869	4,248
Total assets	358,933				335,086					358,933	335,086	218,938
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property												1,048
Intersegment Eliminations [Member]
Net sales										(4,854)	(4,039)	(3,755)
Cost of goods sold										(1,714)	(1,430)	(1,324)
Gross margin										(3,140)	(2,609)	(2,431)
Selling, General and Administrative Expense, Total										(3,140)	(2,609)	(2,431)
Other periodic pension cost
Interest expense
Income before taxes on income
Depreciation and amortization
Capital expenditures
Total assets
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property
Uniforms and Related Products [Member] | Operating Segments [Member]
Net sales										237,554	238,165	204,644
Cost of goods sold										155,283	154,437	132,181
Gross margin										82,271	83,728	72,463
Selling, General and Administrative Expense, Total										73,003	68,848	52,967
Other periodic pension cost										1,962	385	1,224
Interest expense										3,178	2,019	387
Income before taxes on income										4,128	12,476	17,883
Depreciation and amortization										5,975	5,611	4,223
Capital expenditures										8,150	2,794	2,870
Total assets	258,916				254,138					258,916	254,138	146,259
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property												(2)
Remote Staffing Solutions [Member] | Operating Segments [Member]
Net sales										36,490	31,311	23,021
Cost of goods sold										15,066	13,404	10,561
Gross margin										21,424	17,907	12,460
Selling, General and Administrative Expense, Total										13,642	11,160	7,877
Other periodic pension cost
Interest expense
Income before taxes on income										7,782	6,747	5,633
Depreciation and amortization										963	990	846
Capital expenditures										1,095	1,581	1,156
Total assets	23,970				19,717					23,970	19,717	18,170
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property												1,050
Promotional Products [Member] | Operating Segments [Member]
Net sales										107,511	80,913	42,904
Cost of goods sold										79,137	58,242	29,044
Gross margin										28,374	22,671	13,860
Selling, General and Administrative Expense, Total										23,777	19,311	12,179
Other periodic pension cost
Interest expense										1,221	1,188	415
Income before taxes on income										3,376	2,172	1,266
Depreciation and amortization										1,334	1,299	584
Capital expenditures										427	494	219
Total assets	$ 76,047				$ 61,231					$ 76,047	$ 61,231	54,509
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property

[1] On May 2, 2018, the Company acquired CID, which manufactures medical uniforms, lab coats, and layers, and sells its products to specialty uniform retailers, ecommerce medical uniform retailers, and other retailers. For further details relating to this acquisition, refer to Note 18.