Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 3,311	$ 3,232
Adjustments to reconcile net income to operating cash flow:
Depreciation and amortization	2,873	3,239
Non-cash interest expense	11	23
Non-cash rent expense	1	(37)
Bad debt expense	2	(6)
Deferred Revenue	(30)	(91)
Stock-based compensation	1,144	393
Deferred income taxes	257	841
Loss on sale of property and equipment	88	28
(Increase) decrease in operating assets:
Accounts receivable	(1,931)	(1,304)
Inventories	(1,356)	(538)
Refundable income taxes	(313)	649
Prepaid expenses and other current assets	(91)	423
Increase (decrease) in operating liabilities:
Accounts payable	1,022	311
Accrued expenses	504	(1,278)
Operating lease asset amortization/liability	0	0
Accrued income taxes	72	500
Net cash provided by operating activities	5,564	6,385
Cash flows from investing activities:
Purchases of property and equipment	(1,922)	(1,895)
Proceeds from sale of property and equipment	0	5
Acquisition, net of cash acquired	(5,220)	0
Net cash used in investing activities	(7,142)	(1,890)
Cash flows from financing activities:
Purchase of treasury stock	(1,583)	(405)
Payment of deferred financing cost	(32)	0
Proceeds from note payable	5,000	0
Repayment of note payable	(500)	0
Net cash provided by (used in) financing activities	2,885	(405)
Net increase in cash and cash equivalents	1,307	4,090
Cash and cash equivalents at the beginning of the period	7,926	3,836
Cash and cash equivalents at the end of the period	9,233	7,926
Supplemental cash flow information:
Cash paid for income taxes, net of (refunds)	2,288	(426)
Cash paid for interest	102	99
Non-cash investing activities
Increase (decrease) in right-of-use assets and operating lease obligations	45	(44)
Business acquisition escrow payable	580	0
Non-cash financing activities
Issuance of common stock under equity incentive plans	$ 0	$ 522