Condensed Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income	$ 90,307	$ 1,846
Adjustments to reconcile net income to net cash provided by (used in ) operating activities:
Depreciation and amortization	9,578	9,456
Deferred tax expense	35,169	1,381
Share-based compensation expense	2,639	636
Changes in assets and liabilities:
Decrease in receivables on government contracts	558,275	25,130
Decrease (increase) in prepaid expenses and other current assets	2,509	(30,250)
(Decrease) in accrued payroll and payroll taxes	(73,341)	(338,358)
Increase (Decrease) in accounts payable and accrued expenses	23,242	(252,051)
(Decrease) in accrued warranty expense	(142,890)	(28,284)
(Decrease) increase in deferred revenue	(7,500)	2,250
(Decrease) in long-term liabilities	(373)	(1,336)
Net cash provided by (used in) operating activities	497,615	(609,580)
Cash flows from investing activities:
Payments related to intangible assets	(788)
Purchase of property and equipment	(7,560)
Net cash used in investing activities	(8,348)
Cash flows from financing activities:
Proceeds from exercise of stock options	3,350	350
Net cash provided by financing activities:	3,350	350
Net increase (decrease) in cash and cash equivalents	492,617	(609,230)
Cash and cash equivalents, beginning of period	858,868	2,858,655
Cash and cash equivalents, end of period	1,351,485	2,249,425
Supplement cash flow information:
Cash paid during the period for income taxes		$ 44,500