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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Cash flows from operating activities:              
Net income $ (1,196) $ 1,298 $ (250) $ 3,412 $ 483 $ 6,420  
Adjustments to reconcile net income to net cash provided by (used in) operating activities:              
Depreciation and amortization 2,467   2,576   7,373 7,224  
Unrealized foreign currency loss         1,531 302  
Fair value adjustment to earnout liabilities         500 0  
Earnout payments         (587) 0  
(Gain) loss on sale of property and equipment         (67) 104  
Debt discount amortization         304 311  
Share-based compensation expense         2,466 1,237  
Bad debt expense 400   100   456 625  
Inventory reserve expense         428 453  
Deferred income tax benefit         0 13  
Changes in operating assets and liabilities, net of divestitures:              
Accounts receivable         (7,502) 12,705  
Costs and estimated earnings in excess of billings on uncompleted contracts         (5,091) (5,714)  
Inventories         (2,172) 2,568  
Prepaid expense and other current assets         3,448 (1,713)  
Deferred charges and other assets         43 (2,858)  
Accounts payable and accrued expenses         5,655 443  
Billings in excess of costs and estimated earnings on uncompleted contracts         3,903 (13,504)  
Income taxes payable         (23) 21  
Other liabilities         (916) 478  
Net cash provided by operating activities         10,232 9,115  
Cash flows from investing activities:              
Acquisitions of property and equipment         (1,740) (2,875)  
Net proceeds from sale of assets         533 605  
Net cash paid for acquisition         0 (5,895)  
Net cash used in investing activities         (1,207) (8,165)  
Cash flows from financing activities:              
Borrowings on revolving credit lines         32,100 87,000  
Repayments on revolving credit lines         (36,900) (74,500)  
Repayments of long-term debt         (2,188) (4,384)  
Payments on finance leases and financing liability         (411) (333)  
Additional earnout payments         (823) 0  
Proceeds from employee stock purchase plan and exercise of stock options         239 0  
Distributions to non-controlling interests         (107) 0  
Common stock repurchase         (3,745) 0  
Net cash (used in) provided by financing activities         (11,835) 7,783  
Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents, Total         (535) 657  
Net (decrease) increase in cash, cash equivalents and restricted cash         (3,345) 9,390  
Cash, cash equivalents and restricted cash at beginning of period   $ 37,811   $ 36,958 37,811 36,958 $ 36,958
Cash, cash equivalents and restricted cash at end of period $ 34,466   $ 46,348   34,466 46,348 $ 37,811
Cash paid (received) during the period for:              
Interest         1,609 2,450  
Income taxes         $ (2,678) $ (112)