Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (601)	$ (274)
Adjustments to reconcile net loss to operating cash flow:
Depreciation and amortization	2,387	2,633
Bad debt expense	20	50
Reserve for inventory obsolescence	177	580
Stock-based compensation	714	827
Non-cash interest expense	17	9
Deferred revenue	(73)	(72)
(Gain) on sale of property and equipment	(183)	(42)
(Increase) decrease in operating assets:
Accounts receivable	(316)	553
Inventories	(1,118)	280
Refundable income taxes	1,921	(612)
Prepaid expenses and other current assets	(399)	(291)
Increase (decrease) in operating liabilities:
Accounts payable	2,397	(586)
Accrued expenses	53	(588)
Accrued income taxes	(43)	(121)
Net cash provided by operating activities	4,953	2,346
Cash flows from investing activities:
Purchases of property and equipment	(610)	(2,581)
Proceeds from sale of property and equipment	513	90
Purchase of investments	(15)	(500)
Net cash used in investing activities	(112)	(2,991)
Cash flows from financing activities:
Purchase of treasury stock	(538)	(1,309)
Borrowings under revolving credit facility	0	6,050
Repayment of line of credit	(1,789)	0
Payment of deferred financing costs	0	(69)
Repayment of notes payable	0	(6,279)
Net cash used in financing activities	(2,327)	(1,607)
Net increase (decrease) in cash and cash equivalents	2,514	(2,252)
Cash and cash equivalents at the beginning of the period	2,998	4,978
Cash and cash equivalents at the end of the period	5,512	2,726
Supplemental cash flow information:
Cash paid for income taxes, net of (refunds)	(1,937)	724
Cash paid for interest	214	189
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