Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Operating Activities:
Net loss	$ (1,552,000)	$ (1,249,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	291,000	299,000
Stock-based compensation	96,000	206,000
Penalties and waived penalties on dividends	20,000	6,000
Changes in operating assets and liabilities:
Accounts receivable	(165,000)	157,000
Inventories		(33,000)
Prepaid expenses and other assets	(6,000)	48,000
Accounts payable and accrued expenses	60,000	(22,000)
Deferred revenue	9,000	(56,000)
Net cash used in operating activities	(1,244,000)	(638,000)
Investing Activities:
Purchases of property and equipment	(47,000)	(121,000)
Financing Activities:
Proceeds from line of credit	364,000
Payments on line of credit	(364,000)
Borrowings on loan from officer	1,355,000
Principal payments on capital lease equipment	(202,000)	(211,000)
Proceeds from stock options exercised	100,000	66,000
Net cash provided by (used in) financing activities	1,253,000	(145,000)
Net decrease in cash and cash equivalents	(38,000)	(904,000)
Cash and cash equivalents at beginning of year	102,000	1,006,000
Cash and cash equivalents at end of year	64,000	102,000
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid on leased assets	14,000	24,000
Income taxes paid
SUPPLEMENTAL DISCLOSURE OF NON CASH FINANCING ACTIVITIES:
Preferred stock dividends accrued	139,000	160,000
Purchase of equipment through capital lease	$ 66,000	$ 273,000