Condensed Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales	$ 1,069,000	$ 1,306,000	$ 2,110,000	$ 2,621,000
Cost of goods sold	632,000	741,000	1,301,000	1,491,000
Gross profit	437,000	565,000	809,000	1,130,000
Operating expenses:
Research and development	19,000	22,000	44,000	68,000
Selling and marketing	148,000	176,000	310,000	372,000
General and administrative	344,000	388,000	736,000	778,000
Operating Expenses, Total	511,000	586,000	1,090,000	1,218,000
Operating loss	(74,000)	(21,000)	(281,000)	(88,000)
Other income / (expense):
Interest expense	(76,000)	(69,000)	(146,000)	(134,000)
Other income, net	4,000	20,000	15,000	20,000
Interest income	1,000	0	1,000	0
Other income / (expense), Total	(71,000)	(49,000)	(130,000)	(114,000)
Net loss before tax	(145,000)	(70,000)	(411,000)	(202,000)
Income tax expense	(2,000)	(1,000)	(2,000)	(1,000)
Net loss	$ (147,000)	$ (71,000)	$ (413,000)	$ (203,000)
Basic and diluted loss per common share	$ (0.00)	$ (0.00)	$ (0.01)	$ (0.01)
Weighted average number of shares outstanding - basic & diluted	29,936,111	29,242,388	29,879,754	29,043,692