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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net income | $ 1,983 | $ 8,172 | $ 17,707
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation and amortization | 9,853 | 9,921 | 10,609
Unrealized foreign currency loss (gain) | 2,047 | 346 | (526)
Net gain on interest rate swaps | 0 | 0 | (248)
Impairment of intangible assets | 0 | 850 | 0
Fair value adjustments to earnout liabilities | 704 | 1,193 | 0
Earnout payments | (587) |  |
(Gain) loss on sale of property and equipment | (83) | 63 | 78
Loss on divestitures |  |  | (70)
Amortization of debt discount | 404 | 415 | 1,060
Share based compensation expense | 3,335 | 1,758 | 2,668
Bad debt expense | 688 | 928 | 295
Inventory reserve expense | 82 | 494 | 316
Deferred income tax expense (benefit) | 87 | 1,038 | (940)
Changes in operating assets and liabilities, net of acquisitions and divestitures: |  |  |
Accounts receivable | (13,165) | 8,367 | (15,616)
Cost and estimated earnings of billings on uncompleted contracts | (7,007) | (9,561) | (5,029)
Inventories | (203) | 4,366 | (207)
Prepaid expenses and other current assets | 5,911 | (962) | (7,097)
Deferred charges and other assets | 300 | (4,095) | 758
Accounts payable and accrued expenses | 440 | 336 | (4,028)
Billings in excess of costs and estimated earnings on uncompleted contracts | 8,431 | (17,635) | 14,274
Income taxes payable | 1,047 | 460 | (1,671)
Other liabilities | (882) | (2,033) | (2,246)
Net cash provided by operating activities | 13,298 | 4,421 | 10,227
Cash flows from investing activities: |  |  |
Acquisitions of property and equipment | (2,616) | (3,945) | (5,655)
Net proceeds from sale of assets | 533 | 605 | 509
Cash paid for acquisitions |  | (5,895) |
Net cash used in investing activities | (2,083) | (9,235) | (5,146)
Cash flows from financing activities: |  |  |
Borrowings on revolving credit lines | 51,400 | 96,000 | 45,300
Repayments on revolving credit lines. | (57,100) | (86,800) | (52,947)
Repayments of long-term debt | (2,738) | (5,009) | (2,950)
Deferred financing fees paid | (801) |  | (1,117)
Payments on capital leases and sale-leaseback financing liability | (603) | (467) | (478)
Earnout payments | (823) |  |
Proceeds from employee stock purchase plan, exercise of stock options, and dividend reinvestment plan | 230 |  | 76
Distributions to non-controlling interest | (107) |  |
Common stock repurchases | (5,014) |  |
Net cash (used in) provided by financing activities | (15,556) | 3,724 | (12,116)
Effect of exchange rate changes on cash and cash equivalents | (1,475) | 1,943 | (445)
Net (decrease) increase in cash, cash equivalents and restricted cash | (5,816) | 853 | (7,480)
Cash, cash equivalents and restricted cash at beginning of year | 37,811 | 36,958 | 44,438
Cash, cash equivalents and restricted cash at end of year | 31,995 | 37,811 | 36,958
Cash paid (received) during the period for: |  |  |
Interest | 2,146 | 3,172 | 3,549
Income taxes | $ (2,570) | $ 2,156 | $ 5,908

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