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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net (loss) income $ (529) $ 240
Adjustments to reconcile net (loss) income to operating cash flow:    
Depreciation and amortization 1,605 1,732
Bad debt expense 3 20
Reserve for inventory obsolescence 210 271
Stock-based compensation 535 495
Non-cash interest expense 12 3
Deferred revenue (48) (48)
(Gain) on sale of property and equipment (29) (14)
(Increase) decrease in operating assets:    
Accounts receivable (1,297) 66
Inventories (1,235) 243
Refundable income taxes 1,470 (463)
Prepaid expenses and other current assets (308) (584)
Increase (decrease) in operating liabilities:    
Accounts payable 888 423
Accrued expenses 774 (153)
Accrued income taxes (43) (121)
Net cash provided by operating activities 2,008 2,109
Cash flows from investing activities:    
Purchases of property and equipment (290) (2,024)
Proceeds from sale of property and equipment 36 35
Purchase of investments (15) 0
Net cash used in investing activities (269) (1,989)
Cash flows from financing activities:    
Purchase of treasury stock (385) (1,168)
Borrowings under revolving credit facility 0 6,050
Repayment of line of credit (1,330) 0
Payment of deferred financing costs 0 (69)
Repayment of notes payable 0 (6,279)
Net cash used in financing activities (1,715) (1,466)
Net decrease in cash and cash equivalents 24 (1,346)
Cash and cash equivalents at the beginning of the period 2,998 4,978
Cash and cash equivalents at the end of the period 3,022 3,632
Supplemental cash flow information:    
Cash paid for income taxes, net of (refunds) (1,469) 712
Cash paid for interest 149 108
Non-cash investing activities:    
Right-of-use assets recognized at ASU 2016-02 transition 944 0
Operating lease liability recognized at ASU 2016-02 transition 997 0
Right-of-use assets and operating lease liabiliites recognized after ASU 2016-02 transition $ 280 $ 0