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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net income (loss) $ 1,126 $ (529)
Adjustments to reconcile net income (loss) to operating cash flow:    
Depreciation and amortization 1,652 1,605
Non-cash interest expense 12 12
Non-cash rent expense (38) 0
Bad debt expense (4) 3
Deferred revenue (48) (48)
Stock-based compensation 232 535
Deferred income taxes 369 0
(Loss) gain on sale of property and equipment 28 (29)
Reserve for inventory obsolescence 0 210
(Increase) decrease in operating assets:    
Accounts receivable (1,041) (1,297)
Inventories (262) (1,235)
Refundable income taxes 65 1,470
Prepaid expenses and other current assets 502 (308)
Increase (decrease) in operating liabilities:    
Accounts payable (172) 888
Accrued expenses (448) 774
Accrued income taxes (62) (43)
Net cash provided by operating activities 1,911 2,008
Cash flows from investing activities:    
Purchases of property and equipment (728) (290)
Proceeds from sale of property and equipment 5 36
Purchase of investments 0 (15)
Net cash used in investing activities (723) (269)
Cash flows from financing activities:    
Purchase of treasury stock (405) (385)
Repayment of line of credit 0 (1,330)
Net cash used in financing activities (405) (1,715)
Net decrease in cash and cash equivalents 783 24
Cash and cash equivalents at the beginning of the period 3,836 2,998
Cash and cash equivalents at the end of the period 4,619 3,022
Supplemental cash flow information:    
Cash paid for income taxes, net of (refunds) 82 (1,469)
Cash paid for interest 61 149
Non-cash investing and financing activities    
Right-of-use assets recognized at ASU 2016-02 transition 0 944
Operating lease liability recognized at ASU 2016-02 transition 0 997
Increase (decrease) in right-of-use assets and operating lease liabilities recognized after ASU 2016-02 transition (58) 280
Issuance of common stock under equity incentive plans $ 522 $ 0