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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net sales													$ 266,814	$ 252,596	$ 210,317
Gross margin	$ 25,975	$ 24,789	$ 23,374	$ 22,214	$ 22,058	$ 23,140	$ 21,763	$ 20,021	$ 17,882	$ 19,224	$ 18,531	$ 15,796	96,352	86,982	71,433
Selling and administrative expenses													71,816	66,396	52,018
Gain on sale of property, plant and equipment													1,048
Interest expense													802	688	519
Income before taxes on income													24,782	19,898	18,896
Depreciation and amortization													5,653	4,935	3,873
Capital expenditures													4,248	7,385	8,069
Total assets	218,938				196,848				151,731				218,938	196,848	151,731
Uniforms and Related Products [Member]
Net sales													204,644	210,373	198,319
Gross margin													72,463	69,987	65,247
Selling and administrative expenses													54,191	52,225	49,225
Gain on sale of property, plant and equipment													(2)
Interest expense													387	462	519
Income before taxes on income													17,883	17,300	15,503
Depreciation and amortization													4,223	4,023	3,561
Capital expenditures													2,870	3,383	3,003
Total assets	182,623				176,070				140,710				182,623	176,070	140,710
Remote Staffing Solutions [Member]
Net sales													23,021	17,953	15,604
Gross margin													12,460	9,616	8,579
Selling and administrative expenses													7,877	6,096	5,186
Gain on sale of property, plant and equipment													1,050
Interest expense
Income before taxes on income													5,633	3,520	3,393
Depreciation and amortization													846	494	312
Capital expenditures													1,156	3,872	5,066
Total assets	21,846				19,752				14,551				21,846	19,752	14,551
Promotional Products Segment [Member]
Net sales													42,904	27,816
Gross margin													13,860	9,690
Selling and administrative expenses													12,179	10,386
Gain on sale of property, plant and equipment
Interest expense													415	226
Income before taxes on income													1,266	(922)
Depreciation and amortization													584	418
Capital expenditures													219	130
Total assets	54,997				28,480								54,997	28,480
Intersegment Eliminations [Member]
Net sales													(3,755)	(3,546)	(3,606)
Gross margin													(2,431)	(2,311)	(2,393)
Selling and administrative expenses													(2,431)	(2,311)	(2,393)
Gain on sale of property, plant and equipment
Interest expense
Income before taxes on income
Depreciation and amortization
Capital expenditures
Total assets	$ (40,528)				$ (27,454)				$ (3,530)				$ (40,528)	$ (27,454)	$ (3,530)