Condensed Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net loss	$ (267,000)	$ (132,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	20,000	22,000
Amortization of debt issuance costs	33,000	31,000
Allowance for doubtful accounts	(1,000)	0
Provision for slow moving and obsolete inventory	21,000	21,000
Share-based payment expense	4,000	11,000
Changes in:
Accounts receivable	(72,000)	(55,000)
Inventory	64,000	58,000
Prepaid expenses and other current assets	36,000	29,000
Accounts payable	56,000	0
Accrued expenses and other current liabilities	43,000	(20,000)
Wages payable	7,000	(12,000)
Net cash provided by operating activities	(56,000)	(47,000)
Cash flows from investing activities:
Patent application costs	(6,000)	(9,000)
Net cash used in investing activities	(6,000)	(9,000)
Cash flows from financing activities:
Proceeds from / (payments on) debt financing	72,000	(75,000)
Proceeds from lines of credit	1,095,000	1,403,000
Payments on lines of credit	(1,049,000)	(1,292,000)
Net cash provided by financing activities	118,000	36,000
Net change in cash and cash equivalents	56,000	(20,000)
Cash and cash equivalents - beginning of period	36,000	156,000
Cash and cash equivalents - end of period	92,000	136,000
Supplemental disclosures of cash flow information
Cash paid during period for interest	36,000	40,000
Consulting expense prepaid with restricted stock	25,000	0
Debt issuance cost paid with restricted stock	$ 18,000	$ 0