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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 9,042 $ 1,482
Adjustments to reconcile net cash used in operating activities:    
Depreciation and amortization expense 3,164 3,194
Paycheck Protection Program loan forgiveness (9,151) 0
Deferred income taxes 21 21
Change in fair value of interest rate swap agreements 12 157
Stock-based compensation 664 556
Allowance for doubtful accounts (421) 34
Common stock issued under defined contribution 401(k) plan 570 0
Gain on disposal of assets (23) 0
Changes in operating assets and liabilities:    
Accounts receivable (1,856) (7,843)
Employee retention credit receivable (1,714) 0
Contract assets (412) 0
Inventories (5,227) (5,748)
Prepaid expenses and other current assets 1,024 385
Accounts payable (1,342) 520
Accrued liabilities (953) 28
Customer deposits (3,349) (1,001)
Other non-current assets and liabilities (36) (23)
Net cash used in operating activities (9,987) (8,238)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (765) (929)
Proceeds from disposals of property and equipment 23 0
Net cash used in investing activities (742) (929)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from line of credit 82,862 93,358
Payments on line of credit (78,108) (92,768)
Proceeds from long-term debt 387 9,530
Payments on long-term debt (157) (822)
Principal payments on finance leases (728) (428)
Shares withheld for taxes in connection with issuance of restricted stock (1,491) 0
Proceeds from sale of common stock, net 9,349 0
Net cash provided by financing activities 12,114 8,870
NET INCREASE (DECREASE) IN CASH 1,385 (297)
CASH beginning of the period 3,372 2,416
CASH end of the period $ 4,757 $ 2,119