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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 25, 2021 | Dec. 26, 2020 | Dec. 28, 2019
Cash flows from operating activities: |  |  |
Net loss | $ (13,468,371) | $ (4,530,925) | $ (29,374,222)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 668,691 | 651,083 | 792,221
Accretion of premium or discount on marketable debt securities | 7,517 | 7,762 | 21,838
Stock-based compensation | 4,417,422 | 821,122 | 2,057,400
Net (gain) loss on investment transactions | (300,000) | 29,356 | 3,858,453
Income taxes | 128,279 | 116,536 | 105,036
Foreign currency gains | (186,942) | (289,471) | (220,015)
Loss on sale of property and plant | 99,228 |  | 508,833
Impairment of goodwill |  |  | 331,344
Change in allowance for bad debt | (26,704) | (763,159) | 633,131
Write-off of excess inventory | 588,175 | 667,019 | 1,834,300
Change in warranty reserves | 9,552 | (1,172) | (62,107)
Changes in assets and liabilities: |  |  |
Accounts receivable | (3,364,990) | (2,954,703) | (3,944,859)
Contract assets and unbilled receivables | 1,379,436 | (2,600,671) | 2,168,581
Inventory | (2,728,404) | (1,332,139) | (792,165)
Prepaid expenses, other current assets and other assets | (691,573) | (160,371) | 821,340
Accounts payable and accrued expenses | 143,379 | 5,227,011 | (163,084)
Contract liabilities and billings in excess of revenue earned | 2,577,523 | 695,565 | 397,121
Net cash used in operating activities | (10,747,782) | (4,417,157) | (21,026,854)
Cash flows from investing activities: |  |  |
Proceeds from sale of marketable debt securities | 1,100,000 | 12,148,117 | 7,454,139
Equity investments purchase |  |  | (2,500,000)
Other assets | (12,822) | 193,186 | (41,031)
Capital expenditures | (1,033,503) | (542,862) | (170,186)
Net cash provided by investing activities | 53,675 | 11,798,441 | 4,742,922
Cash flows from financing activities: |  |  |
Sale of treasury stock, net of costs | 16,904,173 | 3,829,462 |
Issuance of common stock, net of costs | 4,147,200 |  | 8,038,529
Settlements of restricted stock for tax withholding obligations | (602,080) | (139,926) | (45,513)
Net cash provided by financing activities | 20,449,293 | 3,689,536 | 7,993,016
Effect of exchange rate changes on cash | (80,124) | 12,802 | (6,184)
Net increase (decrease) in cash and cash equivalents | 9,675,062 | 11,083,622 | (8,297,100)
Cash and cash equivalents at beginning of year | 17,112,869 | 6,029,247 | 14,326,347
Cash and cash equivalents at end of year | 26,787,931 | 17,112,869 | 6,029,247
Supplemental disclosure of cash flow information: |  |  |
Construction in progress included in accrued expenses |  | $ 257,000 |

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