Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities
Net income	$ 234,300	$ 1,543,300
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation and amortization	2,300	3,500
Deferred income taxes	(54,400)
Other assets	(27,800)	(1,521,700)
Other liabilities	208,300	106,500
Cumulative effect of accounting change		96,100
Net income adjusted for non-cash operating activities	362,700	227,700
(Increase) decrease in assets
Accounts receivable	(258,800)	6,100
Inventory	(31,400)	(12,000)
Prepaid and other	(9,600)	5,700
Increase (decrease) in liabilities
Accounts payable and accrued expenses	65,100	(190,000)
Taxes on income	(22,300)
Deferred revenue		(99,400)
Total increase in operating capital	(257,000)	(289,600)
Net cash provided by (used in) operating activities	105,700	(61,900)
Investment Activities
Additions to fixed assets		(500)
Net cash used in investing activities		(500)
Increase (decrease) in cash	105,700	(62,400)
Cash at beginning of year	400,800	360,400
Cash at end of period	506,500	298,000
Supplemental Disclosure of Non Cash Lease Activities
Operating lease right of use - building	241,100
Operating lease liability	$ (241,100)