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Basis of presentation, out of period adjustments and restatements of prior periods (Details - Restatement) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2015 | Jun. 30, 2015 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Net sales | $ 29,622 | $ 59,443 | $ 89,042 | $ 118,587 | $ 118,960 | $ 97,524
Cost of goods sold | 21,697 | 45,061 | 65,725 | 88,705 | 90,097 | 69,901
Gross profit | 7,925 | 14,382 | 23,317 | 29,882 | 28,863 | 27,623
Selling expenses | 3,302 | 5,920 | 8,626 | 11,892 | 11,611 | 9,131
General and administrative | 3,034 | 6,645 | 10,643 | 12,871 | 12,301 | 9,748
Amortization expense | 179 | 358 | 537 | 716 | 716 | 713
Total operating expenses | 6,515 | 12,923 | 19,806 | 25,479 | 24,628 | 19,592
Income from operations | 1,410 | 1,459 | 3,511 | 4,403 | 4,235 | 8,031
Scenario Previously Reported [Member] |  |  |  |  |  |
Net sales | 29,622 | 59,443 | 89,042 | 118,587 |  |
Cost of goods sold | 21,239 | 44,044 | 64,588 | 86,986 |  |
Gross profit | 8,383 | 15,399 | 24,454 | 31,601 |  |
Selling expenses | 3,302 | 5,920 | 9,486 | 12,752 | 14,534 | 11,296
General and administrative | 3,492 | 7,662 | 10,920 | 13,730 | (9,378) | 7,583
Amortization expense | 179 | 358 | 537 | 716 | 716 | 713
Total operating expenses | 6,973 | 13,940 | 20,943 | 27,198 | 24,628 | 19,592
Income from operations | 1,410 | 1,459 | 3,511 | 4,403 |  |
Restatement Adjustment [Member] |  |  |  |  |  |
Net sales | 0 | 0 | 0 | 0 |  |
Cost of goods sold | 458 | 1,017 | 1,137 | 1,719 |  |
Gross profit | (458) | (1,017) | (1,137) | (1,719) |  |
Selling expenses | 0 | 0 | (860) | (860) | (2,923) | (2,165)
General and administrative | (458) | (1,017) | (277) | (859) | 2,923 | 2,165
Amortization expense | 0 | 0 | 0 | 0 | 0 | 0
Total operating expenses | (458) | (1,017) | (1,137) | (1,719) | $ 0 | $ 0
Income from operations | $ 0 | $ 0 | $ 0 | $ 0 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Total costs related to goods produced and sold during the reporting period. + 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 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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