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Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Net sales $ 28,786 $ 29,990 $ 92,636 $ 93,691
Cost of goods sold 20,331 21,478 65,262 65,480
Depreciation expense 618 533 1,801 1,797
Total cost of goods sold 20,949 22,011 67,063 67,277
Gross profit 7,837 7,979 25,573 26,414
Selling expenses 4,010 4,306 11,648 10,733
General and administrative 3,145 3,308 10,743 10,300
Amortization expense 168 176 504 529
Total operating expenses 7,323 7,790 22,895 21,562
Income from operations 514 189 2,678 4,852
Other income (expense):        
Interest expense (62) (56) (180) (161)
Gain (loss) on sale of investments, net reclassified from OCI 0 12 0 (15)
Loss on sale of property and equipment (34) (156) (39) (307)
Other income, net 0 28 0 105
Total other income (expense) (96) (172) (219) (378)
Income before provision for income taxes 418 17 2,649 4,474
Provision for income taxes 175 81 1,056 1,476
Net income (loss) $ 243 $ (64) $ 1,403 $ 2,998
Earnings per common share - Basic $ 0.02 $ 0.00 $ 0.09 $ 0.19
Earnings per common share - Diluted $ 0.02 $ 0.00 $ 0.09 $ 0.19
Weighted average number of shares outstanding - Basic 16,093 16,141 16,133 16,159
Weighted average number of shares outstanding - Diluted 16,168 16,161 16,218 16,181
COMPREHENSIVE INCOME (LOSS)        
Net income (loss) $ 243 $ (64) $ 1,403 $ 2,998
Other comprehensive income (loss), net of tax:        
Unrealized gains on investments, net of taxes 0 6 0 62
Reclassifications to earnings:        
Realized (gains) losses on investments, net of taxes 0 (8) 0 9
Comprehensive income (loss) $ 243 $ (66) $ 1,403 $ 3,069