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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income $ 70 $ 124
Adjustments to reconcile net income to operating cash flow:    
Depreciation and amortization 843 754
Bad debt expense 20 0
Reserve for inventory obsolescence 130 50
Stock-based compensation 386 449
Deferred revenue (24) 0
(Gain) loss on sale of property and equipment (15) 5
(Increase) decrease in operating assets:    
Accounts receivable 467 (2,576)
Inventories 52 363
Refundable income taxes (448) 0
Prepaid expenses and other current assets (185) 87
Increase (decrease) in operating liabilities:    
Accounts payable 288 2,553
Accrued expenses (629) 361
Accrued income taxes (102) 80
Net cash provided by operating activities 853 2,250
Cash flows from investing activities:    
Purchases of property and equipment (879) (1,078)
Proceeds from sale of property and equipment 32 34
Net cash used in investing activities (847) (1,044)
Cash flows from financing activities:    
Purchase of treasury stock (1,052) 0
Repayment of notes payable (210) (210)
Net cash used in financing activities (1,262) (210)
Net (decrease) increase in cash and cash equivalents (1,256) 996
Cash and cash equivalents at the beginning of the period 4,978 8,812
Cash and cash equivalents at the end of the period 3,722 9,808
Supplemental cash flow information:    
Cash paid for income taxes, net of refunds 587 0
Cash paid for interest $ 63 $ 57