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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