CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income (loss)	$ (701)	$ 791
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	1,176	1,400
(Gain) loss on sale of assets	(199)	(65)
Allowance for credit losses	67	45
Stock-based compensation expense	171	253
Deferred taxes	96	0
(Increase) decrease in
Accounts receivable - billed	(462)	(2,700)
Accounts receivable - unbilled	337	(121)
Inventories, net	(934)	(686)
Prepaid expenses and other assets	(625)	61
Refundable income taxes	(100)	177
Increase (decrease) in
Accounts payable - trade	(132)	1,661
Accrued expenses and other liabilities	75	364
Deferred revenue	207	(55)
Accrued compensation	4	(265)
Accrued income taxes	(146)	(1,912)
Deferred buy-back lease obligation	0	(1,617)
Customer deposits	2,248	(16)
Net cash provided by (used in) operating activities	1,082	(2,685)
Cash flows from investing activities:
Purchases of property and equipment	(2,974)	(1,962)
Deferred buy-back asset	0	988
Proceeds from the sale of property and equipment	199	65
Net cash provided by (used in) investing activities	(2,775)	(909)
Cash flows from financing activities:
Proceeds from long-term borrowings	0	2,805
Repayments of long-term borrowings	(306)	(278)
Net cash provided by (used in) financing activities	(306)	2,527
Net increase (decrease) in cash	(1,999)	(1,067)
Beginning of period	6,726	13,492
End of period	4,727	12,425
Supplemental Cash Flow Information:
Cash payments for interest	128	118
Cash payments for income taxes	65	2,179
Capital expenditures included in accounts payable	$ 2,244	$ 2,014