CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
OPERATING ACTIVITIES
Net income (loss)	$ 7,955	$ (179,836)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	11,004	11,027
Gain on sale of asset	(25,713)	0
Deferred income taxes	(41,000)	(141,000)
Stock compensation expense	12,407	7,344
Changes in operating assets and liabilities:
Accounts receivable	15,861	851,132
Inventory	(277,894)	(50,712)
Prepaid expenses and other assets	(274,960)	96,533
Accounts payable and accrued expenses	(156,974)	(272,168)
Payroll liabilities	107,516	26,307
Contract liabilities and customer deposits	15,572	(368,717)
Income taxes payable	25,000	107,000
Net cash provided by (used in) operating activities	(581,226)	86,910
INVESTING ACTIVITIES
Capital expenditures	0	(20,615)
Net cash used in investing activities	0	(20,615)
FINANCING ACTIVITIES
Payments on notes payable	(2,221)	0
Repurchase of common stock	0	(92,740)
Net cash used in financing activities	(2,221)	(92,740)
NET DECREASE IN CASH	(583,447)	(26,445)
CASH
Beginning of period	1,290,797	1,322,743
End of Period	707,350	1,296,298
Non-cash investing and financing activities:
Treasury stock cost related to compensation	0	50,599
Note receivable from sale of Colombian receivables	7,800	0
Supplemental cash flow information:
Operating cash outflow for operating lease	$ 15,519	$ 0