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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 6,937 $ 480
Adjustments to reconcile net cash used in operating activities:    
Depreciation and amortization expense 4,758 4,761
Paycheck Protection Program loan forgiveness (9,151) 0
Deferred income taxes 19 12
Change in fair value of interest rate swap agreements 18 161
Stock-based compensation 857 763
Allowance for doubtful accounts (434) 47
Common stock issued under defined contribution 401(k) plan 870 0
Gain on disposal of assets (33) 0
Changes in operating assets and liabilities:    
Accounts receivable (360) (5,898)
Employee retention credit receivable (503) 0
Contract assets 763 (1,475)
Inventories 1,848 6,383
Prepaid expenses and other current assets 689 (303)
Accounts payable (4,321) (3,900)
Accrued liabilities (2,285) 678
Customer deposits (11,139) (4,193)
Other non-current assets and liabilities 644 9
Net cash used in operating activities (10,823) (2,475)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (1,369) (1,597)
Proceeds from disposals of property and equipment 33 0
Net cash used in investing activities (1,336) (1,597)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from line of credit 120,485 142,348
Payments on line of credit (116,446) (146,216)
Proceeds from long-term debt 613 9,530
Payments on long-term debt (159) (1,003)
Principal payments on finance leases (1,197) (694)
Shares withheld for taxes in connection with issuance of restricted stock (1,503) 0
Proceeds from sale of common stock, net 9,329 232
Net cash provided by financing activities 11,122 4,197
NET (DECREASE) INCREASE IN CASH (1,037) 125
CASH beginning of the period 3,372 2,416
CASH end of the period $ 2,335 $ 2,541