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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net (loss) income $ (5,107) $ 9,042
Adjustments to reconcile net cash used in operating activities:    
Depreciation and amortization expense 3,095 3,164
Paycheck Protection Program loan forgiveness 0 (9,151)
Deferred income taxes (9) 21
Change in fair value of interest rate swap agreements 2 12
Stock-based compensation 580 664
Allowance for doubtful accounts 30 (421)
Common stock issued under defined contribution 401(k) plan 613 570
Loss (gain) on disposal of assets 3 (23)
Changes in operating assets and liabilities:    
Accounts receivable (7,389) (1,856)
Employee retention credit receivable 497 (1,714)
Contract assets (2,194) (412)
Inventories (1,552) (5,227)
Prepaid expenses and other current assets 596 1,024
Accounts payable 9,698 (1,342)
Accrued liabilities 656 (953)
Customer deposits (7,789) (3,349)
Other non-current assets and liabilities 6 (36)
Net cash used in operating activities (8,264) (9,987)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (1,697) (765)
Proceeds from disposals of property and equipment 0 23
Net cash used in investing activities (1,697) (742)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from line of credit, net 10,687 4,754
Proceeds from long-term debt 125 387
Payments on long-term debt (107) (157)
Principal payments on finance leases (1,003) (728)
Shares withheld for taxes in connection with issuance of restricted stock (544) (1,491)
Proceeds from sale of common stock, net 0 9,349
Net cash provided by financing activities 9,158 12,114
NET (DECREASE) INCREASE IN CASH (803) 1,385
CASH beginning of the period 852 3,372
CASH end of the period $ 49 $ 4,757