Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net (loss) income	$ (775)	$ 2,924
Adjustments to reconcile net (loss) income to operating cash flow:
Depreciation and amortization	1,513	1,454
Non-cash interest expense	3	9
Non-cash rent expense	0	51
Bad debt expense	0	(1)
Deferred revenue	(15)	(15)
Stock-based compensation	547	301
Loss on sale of property and equipment	0	83
(Increase) decrease in operating assets:
Accounts receivable	(424)	(1,154)
Inventories	(151)	(361)
Refundable income taxes	(440)	(323)
Prepaid expenses and other current assets	154	255
Increase (decrease) in operating liabilities:
Accounts payable	246	(305)
Accrued expenses	(462)	1,276
Accrued income taxes	(725)	(547)
Net cash (used in) provided by operating activities	(529)	3,647
Cash flows from investing activities:
Purchases of property and equipment	(1,710)	(1,161)
Net cash used in investing activities	(1,710)	(1,161)
Cash flows from financing activities:
Repayment of note payable	(500)	0
Net cash used in financing activities	(500)	0
Net (decrease) increase in cash and cash equivalents	(2,739)	2,486
Cash and cash equivalents at the beginning of the period	9,233	7,926
Cash and cash equivalents at the end of the period	6,494	10,412
Supplemental cash flow information:
Cash paid for income taxes, net	640	2,194
Cash paid for interest	88	33
Non-cash investing activities
Increase (decrease) in right-of-use assets and operating lease obligations	$ 36	$ 27