Note 1 - Summary of Significant Accounting Policies - Disaggregation of Net Sales by Major Source (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	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, 2018	Dec. 31, 2017	Dec. 31, 2016
Net sales	$ 95,001	$ 95,870	$ 82,392	$ 73,087	$ 72,450	$ 67,773	$ 65,604	$ 60,987	$ 64,686	$ 65,282	$ 64,660	$ 57,968	$ 346,350	$ 266,814	$ 252,596
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Net sales													342,881
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Net sales													3,469
Uniforms and Related Products [Member]
Net sales													238,166
Uniforms and Related Products [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Net sales													237,095
Uniforms and Related Products [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Net sales													1,071
Remote Staffing Solutions [Member]
Net sales													27,272
Remote Staffing Solutions [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Net sales													27,272
Remote Staffing Solutions [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Net sales
Promotional Products [Member]
Net sales													80,912
Promotional Products [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Net sales													78,514
Promotional Products [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Net sales													$ 2,398