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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Operating Activities:    
Net loss $ (789) $ (931)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 109 146
Stock-based compensation 10 62
Penalties and waived penalties on dividends 15 8
Changes in operating assets and liabilities:    
Accounts receivable 256 21
Prepaid expenses and other assets (14) 15
Inventories (8)
Accounts payable and accrued expenses 135 74
Deferred revenue 543 579
Net cash (used in) provided by operating activities 265 (34)
Investing Activities:    
Purchases of property and equipment (9) (27)
Financing Activities:    
Proceeds from line of credit 364
Payments on line of credit (364)
Proceeds from stock options exercised 11 99
Proceeds from loans from officer 1,330 525
Principal payments on loan from officer (1,190)
Principal payments on capital leases (74) (99)
Net cash provided by financing activities 77 525
Net increase in cash and cash equivalents 333 464
Cash and cash equivalents at beginning of period 64 102
Cash and cash equivalents at end of period 397 566
SUPPLEMENTAL DISCLOSURE OF NON CASH FINANCING ACTIVITIES:    
Preferred stock dividends accrued $ 69 $ 69