v3.20.1

Statements of Cash Flows - USD ($)	12 Months Ended
Statements of Cash Flows - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 30,532	$ 329,210
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	101,230	82,393
Deferred tax expense (benefit)	33,941	(25,878)
Share-based compensation expense	18,876	18,221
Changes in assets and liabilities:
Decrease in receivables on government contracts	455,890	654,259
(Increase) in prepaid expenses and other current assets	(178,287)	(22,175)
(Decrease) increase in accrued payroll and payroll taxes	(541,372)	292,692
(Decrease) in accounts payable and accrued expenses	(267,116)	(174,458)
(Decrease) increase in accrued warranty expense	(153,723)	113,723
(Decrease) increase in deferred revenue	(22,824)	21,074
(Decrease) in long-term liabilities	(1,957)	(2,360)
Net cash (used in) provided by operating activities	(524,810)	1,286,701
Cash flows from investing activities:
Payments related to intangible assets	(730)	(2,745)
Purchase of property and equipment	(63,900)	(250,734)
Net cash used in investing activities:	(64,630)	(253,479)
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	(585,440)	1,033,572
Cash and cash equivalents, beginning of period	2,206,749	1,173,177
Cash and cash equivalents, end of period	1,621,309	2,206,749
Cash paid for income taxes	$ 156,000	$ 121,500

The increase (decrease) during the reporting period in the aggregate amount of long-term liabilities.

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