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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 240 $ 1,160
Adjustments to reconcile net income to operating cash flow:    
Depreciation and amortization 1,732 1,519
Non-cash interest expense 3 0
Bad debt expense 20 0
Reserve for inventory obsolescence 271 131
Stock-based compensation 495 775
Deferred revenue (48) 0
(Gain) loss on sale of property and equipment (14) 5
(Increase) decrease in operating assets:    
Accounts receivable 66 (793)
Inventories 243 (185)
Refundable income taxes (463) (33)
Prepaid expenses and other current assets (584) (500)
Increase (decrease) in operating liabilities:    
Accounts payable 423 564
Accrued expenses (154) 1,259
Accrued income taxes (121) (579)
Net cash provided by operating activities 2,109 3,323
Cash flows from investing activities:    
Purchases of property and equipment (2,024) (2,400)
Proceeds from sale of property and equipment 35 34
Net cash used in investing activities (1,989) (2,366)
Cash flows from financing activities:    
Borrowings under revolving credit facility 6,050 0
Payment of deferred financing costs (69) 0
Purchase of treasury stock (1,168) 0
Repayment of notes payable (6,279) (420)
Net cash used in financing activities (1,466) (420)
Net (decrease) increase in cash and cash equivalents (1,346) 537
Cash and cash equivalents at the beginning of the period 4,978 8,812
Cash and cash equivalents at the end of the period 3,632 9,349
Supplemental cash flow information:    
Cash paid for income taxes, net of refunds 712 1,493
Cash paid for interest $ 108 $ 118