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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:    
Net income (loss) $ 453 $ (3,086)
Adjustments to reconcile net income (loss) to operating cash flow:    
Depreciation and amortization 3,338 3,477
Non-cash interest expense 23 14
Non-cash rent expense (17) 0
Bad debt expense 7 21
Deferred revenue (97) (97)
Reserve for inventory obsolescence (52) 558
Stock-based compensation 838 802
Deferred income taxes 533 (451)
Fair value gain on investment (1,731) 0
Net gain on sale of investment (1,413) 0
Gain on sale of property and equipment (189) (54)
Goodwill impairment 0 1,244
(Increase) decrease in operating assets:    
Accounts receivable (423) 2,379
Inventories (523) 1,322
Refundable income taxes 2,067 (401)
Prepaid expenses and other current assets (526) (78)
Increase (decrease) in operating liabilities:    
Accounts payable 710 (2,278)
Accrued expenses 783 (858)
Operating lease asset amortization/liability (17) 0
Accrued income taxes 47 (97)
Net cash provided by operating activities 3,811 2,417
Cash flows from investing activities:    
Purchases of investments (15) (500)
Proceeds from sale of investments 1,509 500
Purchases of property and equipment (1,178) (2,824)
Proceeds from sale of property and equipment 522 104
Net cash used in investing activities 838 (2,720)
Cash flows from financing activities:    
Purchase of treasury stock (538) (1,379)
Borrowings under revolving credit facility 0 6,050
Repayment of line of credit (3,273) 0
Payment of deferred financing costs 0 (69)
Repayment of notes payable 0 (6,279)
Net cash used in financing activities (3,811) (1,677)
Net increase (decrease) in cash and cash equivalents 838 (1,980)
Cash and cash equivalents at the beginning of the period 2,998 4,978
Cash and cash equivalents at the end of the period 3,836 2,998
Supplemental cash flow information:    
Cash paid for income taxes, net of (refunds) (1,865) 723
Cash paid for interest 259 261
Right-of-use assets and operating lease obligations recognized at ASU 2016-02 transition 997 0
Right-of-use assets and operating lease obligations recognized after ASU 2016-02 transition $ 305 $ 0