Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net (loss) income	$ (132,448)	$ 274,161
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	61,584	63,795
Deferred tax expense (benefit)	2,170	(47,032)
Share-based compensation expense	14,577	13,682
Changes in assets and liabilities:
Decrease (increase) in receivables on government contracts	691,051	(243,585)
(Increase) in prepaid expenses and other current assets	(239,356)	(8,618)
(Decrease) increase in accrued payroll and payroll taxes	(366,860)	189,890
(Decrease) in accounts payable and accrued expenses	(265,904)	(122,176)
(Decrease) increase in accrued warranty expense	(52,888)	90,370
(Decrease) increase in deferred revenue	(4,651)	6,500
(Decrease) in long-term liabilities	(1,542)	(2,990)
Net cash (used in) provided by operating activities	(294,266)	213,997
Cash flows from investing activities:
Payments related to intangible assets	(233)	(2,263)
Purchase of property and equipment	(32,127)	(96,455)
Net cash used in investing activities:	(32,360)	(98,718)
Cash flows from financing activities:
Exercise of stock options	4,000	350
Net cash provided by financing activities:	4,000	350
Net (decrease) increase in cash and cash equivalents	(322,626)	115,629
Cash and cash equivalents, beginning of period	2,206,749	1,173,177
Cash and cash equivalents, end of period	1,884,123	1,288,806
Cash paid for income taxes	$ 121,000	$ 66,500