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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