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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net income (loss) $ 2,952 $ (601)
Adjustments to reconcile net income (loss) to operating cash flow:    
Depreciation and amortization 2,443 2,387
Non-cash interest expense 17 17
Non-cash rent expense (38) 0
Bad debt expense (3) 20
Deferred revenue (73) (73)
Stock-based compensation 274 714
Deferred income taxes 369 0
Loss (gain) on sale of property and equipment 28 (183)
Reserve for inventory obsolescence 0 177
(Increase) decrease in operating assets:    
Accounts receivable (1,464) (316)
Inventories (80) (1,118)
Refundable income taxes 492 1,921
Prepaid expenses and other current assets 248 (399)
Increase (decrease) in operating liabilities:    
Accounts payable 756 2,397
Accrued expenses (595) 53
Accrued income taxes 22 (43)
Net cash provided by operating activities 5,348 4,953
Cash flows from investing activities:    
Purchases of property and equipment (1,168) (610)
Proceeds from sale of property and equipment 5 513
Purchase of investments 0 (15)
Net cash used in investing activities (1,163) (112)
Cash flows from financing activities:    
Purchase of treasury stock (405) (538)
Repayment of line of credit 0 (1,789)
Net cash used in financing activities (405) (2,327)
Net decrease in cash and cash equivalents 3,780 2,514
Cash and cash equivalents at the beginning of the period 3,836 2,998
Cash and cash equivalents at the end of the period 7,616 5,512
Supplemental cash flow information:    
Cash paid for income taxes, net of (refunds) 335 (1,937)
Cash paid for interest 82 214
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