Condensed Consolidated Statements of Income (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net sales	$ 12,109,000	$ 11,282,000	$ 23,551,000	$ 22,032,000
Cost of goods sold, excluding depreciation and amortization	7,390,000	6,795,000	14,377,000	13,252,000
Gross profit	4,719,000	4,487,000	9,174,000	8,780,000
Operating expenses:
Selling, general and administrative	3,468,000	3,346,000	7,349,000	6,819,000
Depreciation and amortization	144,000	125,000	290,000	279,000
Total operating expenses	3,612,000	3,471,000	7,639,000	7,098,000
Income from operations	1,107,000	1,016,000	1,535,000	1,682,000
Other income:
Equity in income of unconsolidated affiliate	151,000	129,000	290,000	234,000
Unrealized loss on marketable securities	(97,000)		(65,000)
Interest income, net	1,000	1,000	1,000	2,000
Total other income	55,000	130,000	226,000	236,000
Income before provision for income taxes	1,162,000	1,146,000	1,761,000	1,918,000
Provision for income taxes	203,000	342,000	294,000	564,000
Net income	$ 959,000	$ 804,000	$ 1,467,000	$ 1,354,000
Basic earnings per common share (in dollars per share)	$ 0.07	$ 0.05	$ 0.10	$ 0.09
Diluted earnings per common share (in dollars per share)	$ 0.07	$ 0.05	$ 0.10	$ 0.09
Basic weighted average common shares outstanding (in shares)	14,086,277	14,953,217	14,151,734	15,079,733
Diluted weighted average common shares outstanding (in shares)	14,127,934	15,006,089	14,219,063	15,151,032