Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 80,805	$ 153,305
Adjustments to reconcile net income to net cash provided by (used in ) operating activities:
Depreciation and amortization	20,502	12,695
Deferred tax benefit	(3,084)	(9,901)
Share-based compensation expense	4,539	4,604
Changes in assets and liabilities:
(Increase) decrease in receivables on government contracts	(257,974)	70,119
Decrease (increase) in prepaid expenses and other current assets	20,096	(206,516)
Increase in accrued payroll and payroll taxes	(309,349)	(63,210)
(Decrease) increase in accounts payable and accrued expenses	(103,995)	313,864
(Decrease) in accrued warranty expense	(6,773)
(Decrease) in deferred revenue	(2,603)	(11,250)
(Decrease) in long-term liabilities	(1,237)	(805)
Net cash (used in) provided by operating activities	(559,073)	262,905
Cash flows from investing activities:
Payments related to intangible assets		(267)
Purchase of property and equipment	(30,842)	(19,050)
Net cash used in investing activities:	(30,842)	(19,317)
Cash flows from financing activities:
Exercise of stock options		350
Net cash provided by financing activities:		350
Net (decrease) increase in cash and cash equivalents	(589,915)	243,938
Cash and cash equivalents, beginning of period	2,206,749	1,173,177
Cash and cash equivalents, end of period	$ 1,616,834	$ 1,417,115