Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities
Net income	$ 224,200	$ 167,000
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	5,400	5,500
Accretion of interest - convertible debentures	13,200	500
Net income adjusted for non-cash operating activities	242,800	173,000
(Increase) decrease in assets
Accounts receivable	45,500	(159,800)
Inventory	(40,900)	(36,700)
Prepaid and other	8,100	10,700
Increase (decrease) in liabilities
Accounts payable and accrued expenses	(52,700)	75,600
Deferred revenue	(24,200)	(22,200)
Total increase in operating capital	(64,200)	(132,400)
Net cash provided by operating activities	178,600	40,600
Investing Activities
Additions to fixed assets	(4,900)	(1,400)
Net cash used in investing activities	(4,900)	(1,400)
Financing Activities
Repayment of demand loans	(10,000)	(13,500)
Net cash used in financing activities	(10,000)	(13,500)
Increase in cash	163,700	25,700
Cash at beginning of year	199,100	11,400
Cash at end of period	$ 362,800	$ 37,100