Condensed Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income	$ 274,161	$ 195,537
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	63,795	33,657
Deferred taxes	(47,032)	63,260
Share-based compensation expense	13,682	9,782
Changes in assets and liabilities:
(Increase) decrease in receivables on government contracts	(243,585)	339,333
(Increase) in prepaid expenses and other current assets	(8,618)	(27,622)
Increase in accrued payroll and payroll taxes	189,890	49,286
(Decrease) in accounts payable and accrued expenses	(122,176)	(140,764)
Increase (decrease) in accrued warranty expense	90,370	(240,980)
Increase in deferred revenue	6,500	22,500
(Decrease) in long-term liabilities	(2,990)	(1,696)
Net cash provided by operating activities	213,997	302,293
Cash flows from investing activities:
Payments related to intangible assets	(2,263)	(4,983)
Purchase of property and equipment	(96,455)	(88,739)
Net cash used in investing activities:	(98,718)	(93,722)
Cash flows from financing activities:
Exercise of stock options	350	12,350
Net cash provided by financing activities:	350	12,350
Net increase in cash and cash equivalents	115,629	220,921
Cash and cash equivalents, beginning of period	1,173,177	858,868
Cash and cash equivalents, end of period	1,288,806	1,079,789
Supplement cash flow information:
Cash paid during the period for income taxes	$ 66,500	$ 70,150