Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
OPERATING ACTIVITIES
Net income	$ 815,998	$ 514,965
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	47,952	45,845
Gain on sale of asset	(25,713)	0
Deferred income taxes	(12,000)	39,000
Bad debt expense	115,000	125,405
Stock issued for services	9,450	14,097
Stock compensation expense	44,562	34,438
Changes in operating assets and liabilities:
Accounts receivable	(1,021,403)	546,167
Inventory	(501,424)	(295,958)
Prepaid expenses and other assets	(554,944)	611,239
Accounts payable and accrued expenses	(74,304)	(184,617)
Payroll liabilities	10,112	4,303
Contract liabilities and customer deposits	1,422,545	(1,306,496)
Income taxes receivable(payable)	(220,700)	(9,600)
Net cash provided by operating activities	55,131	138,788
INVESTING ACTIVITIES
Proceeds from sale of Colombian receivables	7,000	0
Capital expenditures	(35,445)	(50,715)
Net cash used in investing activities	(28,445)	(50,715)
FINANCING ACTIVITIES
Payments on notes payable	(2,221)	(7,779)
Repurchase of common stock	(51,500)	(112,240)
Net cash used in financing activities	(53,721)	(120,019)
NET DECREASE IN CASH	(27,035)	(31,946)
CASH
Beginning of period	1,290,797	1,322,743
End of period	1,263,762	1,290,797
Non-cash investing and financing activities:
Treasury stock cost related to compensation	2,370	62,026
Note from sale of Colombian receivables	800	0
Capital expenditure financed with a note payable	0	10,000
Supplemental cash flow information:
Operating cash outflow for operating leases	$ 65,166	$ 0