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Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Net sales $ 28,742 $ 32,117
Cost of goods sold 20,025 23,074
Depreciation expense 680 586
Total cost of goods sold 20,705 23,660
Gross profit 8,037 8,457
Selling expenses 4,018 4,238
General and administrative expense 3,705 3,785
Amortization expense 163 168
Total operating expenses 7,886 8,191
Income from operations 151 266
Other income (expense):    
Interest expense (63) (57)
Gain (loss) on sale of investments 15 (5)
Other income, net 5
Total other income (expense) (43) (62)
Income before provision for income taxes 108 204
Provision for income taxes 38 80
Net income $ 70 $ 124
Earnings per common share - Basic $ 0.00 $ 0.01
Earnings per common share - Diluted $ 0.00 $ 0.01
Weighted average number of shares - Basic 15,908 16,154
Weighted average number of shares - Diluted 16,019 16,156