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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)

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