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Note 1 - Summary of Significant Interim Accounting Policies - Disaggregation of Net Sales by Major Source (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Net sales | $ 82,392 | $ 65,604 | $ 155,479 | $ 126,591
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |
Net sales | 85,331 |  | 154,689 |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |
Net sales | (2,939) |  | 790 |
Uniforms and Related Products [Member] |  |  |  |
Net sales | 56,403 |  | 104,528 |
Uniforms and Related Products [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |
Net sales | 60,001 |  | 105,126 |
Uniforms and Related Products [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |
Net sales | (3,598) |  | (598) |
Remote Staffing Solutions [Member] |  |  |  |
Net sales | 6,975 |  | 13,261 |
Remote Staffing Solutions [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |
Net sales | 6,975 |  | 13,261 |
Remote Staffing Solutions [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |
Net sales |  |  |  |
Promotional Products [Member] |  |  |  |
Net sales | 19,014 |  | 37,690 |
Promotional Products [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |
Net sales | 18,355 |  | 36,302 |
Promotional Products [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |
Net sales | $ 659 |  | $ 1,388 |

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