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13. Segment Information (Details - Operations) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2017 | Jul. 02, 2016 | Jul. 01, 2017 | Jul. 02, 2016
Revenues | $ 25,782 | $ 24,756 | $ 49,021 | $ 50,101
Gross profit | 8,719 | 6,436 | 14,742 | 12,627
Operating income (loss) | 2,585 | (1,093) | 876 | (1,880)
Depreciation and amortization | 284 | 309 | 609 | 634
Interest expense | 132 | 304 | 429 | 587
Retail [Member] |  |  |  |
Revenues | 15,038 | 16,017 | 30,827 | 32,666
Gross profit | 4,730 | 4,373 | 8,937 | 9,060
Operating income (loss) | 1,880 | (487) | 1,802 | (437)
Depreciation and amortization | 44 | 51 | 89 | 105
Interest expense | 6 | 1 | 7 | 249
Recycling [Member] |  |  |  |
Revenues | 11,344 | 8,739 | 18,794 | 17,435
Gross profit | 3,989 | 2,063 | 5,805 | 3,567
Operating income (loss) | 705 | (606) | (926) | (1,443)
Depreciation and amortization | 263 | 258 | 520 | 529
Interest expense | $ 126 | $ 303 | $ 422 | $ 338

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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