Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (1,487)	$ (4,523)
Income from discontinued operations		63
Loss from continuing operations	(1,487)	(4,586)
Adjustments to reconcile net cash provided by operating activities:
Depreciation and amortization expense	6,279	7,497
Deferred income taxes	(4)	(30)
Change in fair value of interest rate swap agreements	167	34
Stock-based compensation	1,156	958
Allowance for doubtful accounts	346	(63)
Common stock issued under defined contribution 401(k) plan		962
Gain on disposal of assets		(1)
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	2,627	(792)
Contract assets	(2,253)
Inventories	5,139	(9,193)
Prepaid expenses and other current assets	(865)	(585)
Accounts payable	(3,320)	9,769
Accrued liabilities	1,229	1,105
Customer deposits	(3,898)	(790)
Other non-current assets and liabilities	75	236
Net cash provided by operating activities	5,191	4,521
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(1,547)	(1,844)
Proceeds from disposals of property and equipment		1
Net cash used in investing activities	(1,547)	(1,843)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from line of credit	153,891	177,081
Payments on line of credit	(164,163)	(176,564)
Proceeds from long-term debt	9,530
Payments on long-term debt	(1,186)	(937)
Principal payments on finance leases	(992)	(1,024)
Proceeds from sale of common stock, net	232
Net cash used in financing activities	(2,688)	(1,444)
DISCONTINUED OPERATIONS:
Operating cash flows		5
Net cash provided by discontinued operations		5
NET INCREASE IN CASH	956	1,239
CASH beginning of the period	2,416	1,177
CASH end of the period	3,372	2,416
Supplemental cash flow information:
Interest paid	1,449	1,619
Income taxes paid	81	49
Non-cash activities:
Issuance of restricted stock grants	1,156	958
Equipment additions via finance lease	3,196	704
Non-cash purchases of property and equipment	$ 376	$ 552