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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating Activities    
Net loss $ (413) $ (586)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 20 20
Loss on disposal of equipment 0 6
Bad debt recovery 0 (21)
Stock based compensation 23 46
Provision for excess and obsolete inventories 7 153
Changes in operating assets and liabilities:    
Accounts receivable (73) 277
Inventories 83 (145)
Prepaid expenses and other current assets 1 (4)
Accounts payable 127 190
Accrued liabilities 16 26
Net cash used in operating activities (209) (38)
Investing Activities    
Purchases of equipment 0 (78)
Net cash used in investing activities 0 (78)
Financing Activities    
Costs of stock purchase (7) 0
Purchases of common stock for treasury 0 (10)
Proceeds from stock option exercises 24 0
Net cash provided by (used in) financing activities 17 (10)
Decrease in cash (192) (126)
Cash - beginning of period 3,381 462
Cash - end of period $ 3,189 $ 336