Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 480	$ (2,958)
Adjustments to reconcile net cash (used in) provided by operating activities:
Depreciation and amortization expense	4,761	5,006
Deferred income taxes	12	(11)
Change in fair value of interest rate swap agreements	161	50
Stock-based compensation	763	765
Allowance for doubtful accounts	47	(30)
Common stock issued under defined contribution 401(k) plan		669
Gain on disposal of assets		(1)
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	(5,898)	(5,377)
Contract assets	(1,475)
Inventories	6,383	(8,580)
Prepaid expenses and other current assets	(303)	(737)
Accounts payable	(3,900)	6,046
Accrued liabilities	678	1,632
Customer deposits	(4,193)	7,557
Other non-current assets and liabilities	9	303
Net cash (used in) provided by operating activities	(2,475)	4,334
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(1,597)	(1,776)
Proceeds from disposals of property and equipment		1
Net cash used in investing activities	(1,597)	(1,775)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from line of credit	142,348	131,865
Payments on line of credit	(146,216)	(134,136)
Proceeds from long-term debt	9,530
Payments on long-term debt	(1,003)	(698)
Principal payments on finance leases	(694)	(752)
Proceeds from sale of common stock, net	232
Net cash provided by (used in) financing activities	4,197	(3,721)
NET INCREASE (DECREASE) IN CASH	125	(1,162)
CASH beginning of the period	2,416	1,177
CASH end of the period	$ 2,541	$ 15