Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities:
Net income (loss)	$ 346	$ (351)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	33	55
Stock-based compensation	5	5
Penalties on dividends	12	7
Changes in operating assets and liabilities:
Accounts receivable	(282)	222
Inventories	15
Prepaid expenses and other assets	(92)	(42)
Accounts payable and accrued expenses	87	15
Deferred revenue	(330)	(328)
Net cash used in operating activities	(206)	(417)
Investing Activities:
Purchases of property and equipment	(37)	(9)
Financing Activities:
Borrowings on loan from officer	100	580
Proceeds from stock options exercised	70	11
Principal payments on capital leases	(18)	(36)
Net cash provided by financing activities	152	555
Net increase (decrease) in cash and cash equivalents	(91)	129
Cash and cash equivalents at beginning of period	224	64
Cash and cash equivalents at end of period	133	193
SUPPLEMENTAL DISCLOSURE OF NON CASH FINANCING ACTIVITIES:
Preferred stock dividends accrued	36	35
Purchase of leased equipment per capital lease	$ 41