Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net income	$ 1,655,400	$ 381,200
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	7,100	7,500
Deferred income taxes	108,800
Accretion of interest - convertible debentures		13,200
Non-current assets and liabilities - net	(1,257,500)
Cumulative effect of accounting change	96,100
Net income (loss) adjusted for non-cash operating activities	609,900	401,900
Increase in assets
Accounts receivable	(286,900)	(48,700)
Inventory	(22,900)	(39,700)
Prepaid and other	(8,300)	(5,700)
Increase (decrease) in liabilities
Accounts payable and accrued expenses	(190,100)	(123,400)
Income taxes	38,600
Deferred revenue	(99,400)	(6,900)
Total increase (decrease) in operating capital	(569,000)	(224,400)
Net cash provided by operating activities	40,900	177,500
Investing Activities
Additions to fixed assets	(500)	(6,600)
Net cash used in investing activities	(500)	(6,600)
Financing Activities
Repayment of demand loan		(10,000)
Issuance of common stock		400
Net cash used in financing activities		(9,600)
Increase in cash	40,400	161,300
Cash
Beginning of year	360,400	199,100
End of year	400,800	360,400
Cash paid for interest	$ 1,000	$ 5,800