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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net income (loss) $ 146 $ (388)
Adjustments to reconcile net income (loss) to operating cash flow:    
Depreciation and amortization 806 818
Non-cash interest expense 6 6
Non-cash rent expense (11) 0
Bad debt expense 1 0
Deferred revenue (24) (24)
Stock-based compensation 117 353
Deferred income taxes 370 0
(Gain) on sale of property and equipment (5) (25)
Reserve for inventory obsolescence 0 30
(Increase) decrease in operating assets:    
Accounts receivable (1,739) (1,099)
Inventories (491) (727)
Refundable income taxes (346) 1,490
Prepaid expenses and other current assets 312 (57)
Increase (decrease) in operating liabilities:    
Accounts payable 833 1,031
Accrued expenses (981) (207)
Operating lease asset amortization/liability (11) 0
Accrued income taxes (38) (19)
Net cash (used in) provided by operating activities (1,055) 1,182
Cash flows from investing activities:    
Purchases of property and equipment (403) (137)
Proceeds from sale of property and equipment 5 31
Purchase of investments 0 (15)
Net cash used in investing activities (398) (121)
Cash flows from financing activities:    
Purchase of treasury stock (405) (205)
Repayment of line of credit 0 (1,330)
Net cash used in financing activities (405) (1,535)
Net decrease in cash and cash equivalents (1,858) (474)
Cash and cash equivalents at the beginning of the period 3,836 2,998
Cash and cash equivalents at the end of the period 1,978 2,524
Supplemental cash flow information:    
Cash paid for income taxes, net of (refunds) 65 (1,525)
Cash paid for interest 35 84
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
Right-of-use assets and operating lease liabilities recognized after ASU 2016-02 transition 113 242
Issuance of common stock under equity incentive plans $ 516 $ 0