Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating Activities
Net income	$ 381,200	$ 258,500
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	7,500	7,300
Accretion of interest - convertible debentures	13,200	500
Net income (loss) adjusted for non-cash operating activities	401,900	266,300
(Increase) decrease in assets
Accounts receivable	(48,700)	9,900
Inventory	(39,700)	(34,300)
Prepaid and other	(5,700)	(7,000)
Decrease in liabilities
Accounts payable and accrued expenses	(123,400)	(26,200)
Deferred revenue	(6,900)	(6,100)
Total increase (decrease) in operating capital	(224,400)	(63,700)
Net cash provided by operating activities	177,500	202,600
Investing Activities
Additions to fixed assets	(6,600)	(1,400)
Net cash used in investing activities	(6,600)	(1,400)
Financing Activities
Repayment of demand loans	(10,000)	(13,500)
Exercise of warrants	400
Net cash used in financing activities	(9,600)	(13,500)
Increase in cash	161,300	187,700
Cash
Beginning of year	199,100	11,400
End of year	360,400	199,100
Cash paid for interest	$ 5,800	$ 12,600