Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating Activities
Net income	$ 1,544,400	$ 224,200
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation and amortization	5,300	5,400
Deferred income taxes	106,000
Accretion of interest - convertible debentures		13,200
Non-current assets and liabilities, net	(1,324,200)
Cumulative effect of accounting change	96,100
Net income adjusted for non-cash operating activities	427,600	242,800
(Increase) decrease in assets
Accounts receivable	(308,000)	45,500
Inventory	(20,100)	(40,900)
Prepaid and other	(8,000)	8,100
Increase (decrease) in liabilities
Accounts payable and accrued expenses	(159,000)	(52,700)
Income taxes	93,300
Deferred revenue	(99,400)	(24,200)
Total increase in operating capital	(501,200)	(64,200)
Net cash provided by (used in) operating activities	(73,600)	178,600
Investing Activities
Additions to fixed assets	(500)	(4,900)
Net cash used in investing activities	(500)	(4,900)
Financing Activities
Repayment of demand loan		(10,000)
Net cash used in financing activities		(10,000)
Increase (decrease) in cash	(74,100)	163,700
Cash at beginning of year	360,400	199,100
Cash at end of period	$ 286,300	$ 362,800