CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income (loss)	$ 565	$ 796
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	1,795	2,127
(Gain) loss on sale of assets	(252)	(94)
Allowance for credit losses	(53)	0
Stock-based compensation expense	261	379
Deferred taxes	0	(5)
(Increase) decrease in
Accounts receivable - billed	(630)	(3,163)
Accounts receivable - unbilled	(254)	161
Inventories, net	(390)	(1,139)
Prepaid expenses and other assets	(685)	(104)
Refundable income taxes	1	235
Increase (decrease) in:
Accounts payable - trade	(340)	2,506
Accrued expenses and other liabilities	383	(230)
Deferred revenue	1,288	227
Accrued compensation	(14)	(444)
Accrued income taxes	89	(1,918)
Deferred buy-back lease obligation	0	(2,851)
Customer deposits	1,699	184
Net cash provided by (used in) operating activities	3,463	(3,333)
Cash flows from investing activities:
Purchases of property and equipment	(4,131)	(3,739)
Deferred buy-back asset	0	1,909
Proceeds from the sale of property and equipment	252	103
Net cash provided by (used in) investing activities	(3,879)	(1,727)
Cash flows from financing activities:
Proceeds from long-term borrowings	0	2,805
Repayments of long-term borrowings	(461)	(429)
Net cash provided by (used in) financing activities	(461)	2,376
Net increase (decrease) in cash	(877)	(2,684)
Beginning of period	6,726	13,492
End of period	5,849	10,808
Supplemental Cash Flow Information:
Cash payments for interest	192	187
Cash payments for income taxes	6	2,179
Capital expenditures included in accounts payable	$ 2,625	$ 1,340