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Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
Net sales $ 31,733 $ 31,131 $ 63,850 $ 63,701
Cost of goods sold 21,857 20,763 44,931 44,002
Depreciation expense 597 633 1,183 1,264
Total cost of goods sold 22,454 21,396 46,114 45,266
Gross profit 9,279 9,735 17,736 18,435
Selling expense 3,400 3,463 7,638 6,427
General and administrative 3,813 3,046 7,598 6,992
Amortization expense 168 177 336 353
Total operating expenses 7,381 6,686 15,572 13,772
Income from operations 1,898 3,049 2,164 4,663
Other income (expense):        
Interest expense (61) (47) (118) (105)
Loss on sale of investments, net reclassified from OCI 0 (15) 0 (27)
Loss on sale of property and equipment 0 (151) (5) (151)
Other income, net 0 60 0 77
Total other income (expense) (61) (153) (123) (206)
Income before provision for income taxes 1,837 2,896 2,041 4,457
Provision for income taxes 801 789 881 1,395
Net income $ 1,036 $ 2,107 $ 1,160 $ 3,062
Earnings per common share - Basic $ 0.06 $ 0.13 $ 0.07 $ 0.19
Earnings per common share - Diluted $ 0.06 $ 0.13 $ 0.07 $ 0.19
Weighted average number of shares outstanding - Basic 16,154 16,149 16,154 16,169
Weighted average number of shares outstanding - Diluted 16,203 16,149 16,211 16,169
COMPREHENSIVE INCOME        
Net income $ 1,036 $ 2,107 $ 1,160 $ 3,062
Other comprehensive income (loss), net of tax:        
Unrealized gains on investments, net of taxes 0 12 0 56
Reclassifications to earnings:        
Realized gains losses on investments, net of taxes 0 24 0 17
Comprehensive income $ 1,036 $ 2,143 $ 1,160 $ 3,135