Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating Activities:
Net loss	$ (30,000)	$ (1,552,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	206,000	291,000
Stock-based compensation	18,000	96,000
Penalties and waived penalties on dividends	33,000	20,000
Gain on sale of investment	(56,000)
Changes in operating assets and liabilities:
Accounts receivable	(217,000)	(165,000)
Inventories	30,000
Prepaid expenses and other assets	(14,000)	(6,000)
Accounts payable and accrued expenses	291,000	60,000
Deferred revenue	11,000	9,000
Net cash provided by (used in) operating activities	272,000	(1,244,000)
Investing Activities:
Proceeds from sale of investments	56,000
Purchases of property and equipment	(20,000)	(47,000)
Net cash provided by (used by) investing activities	36,000	(47,000)
Financing Activities:
Proceeds from line of credit		364,000
Payments on line of credit		(364,000)
Borrowings on loan from officer	1,870,000	1,355,000
Payments on loans from officer	(1,890,000)
Principal payments on capital lease equipment	(139,000)	(202,000)
Proceeds from stock options exercised	11,000	100,000
Net cash provided by (used in) financing activities	(148,000)	1,253,000
Net decrease in cash and cash equivalents	160,000	(38,000)
Cash and cash equivalents at beginning of year	64,000	102,000
Cash and cash equivalents at end of year	224,000	64,000
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid on leased assets	6,000	14,000
Income taxes paid
SUPPLEMENTAL DISCLOSURE OF NON CASH FINANCING ACTIVITIES:
Preferred stock dividends accrued	139,000	139,000
Purchase of equipment through capital lease		$ 66,000