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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 30, 2023
Dec. 31, 2022
Dec. 25, 2021
Cash flows from operating activities:      
Net loss $ (19,748,219) $ (19,326,265) $ (13,468,371)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 608,222 722,024 668,691
Accretion of premium or discount on marketable debt securities 128 7,517
Stock-based compensation 3,875,273 1,267,705 4,417,422
Net loss (gain) on remeasurement of investments 2,887,893 (2,700,000) (300,000)
Income taxes 143,345 128,279
Foreign currency losses (gains) 91,791 449,443 (186,942)
Loss on sale of property and plant 46,231 317,032 99,228
Change in allowance for credit losses 709,721 162,638 (26,704)
Write-off of excess inventory 1,143,622 2,078,750 588,175
Change in warranty reserves 193,708 2,329,000 9,552
Changes in assets and liabilities:      
Accounts receivable (5,271,763) 6,806,578 (3,364,990)
Contract assets and unbilled receivables 821,094 (1,835,518) 1,379,436
Inventory (2,255,352) (2,010,749) (2,728,404)
Prepaid expenses, other current assets and other assets (202,504) 908,156 (691,573)
Accounts payable and accrued expenses 1,836,038 (3,859,768) 143,379
Contract liabilities and billings in excess of revenue earned 3,568 (3,139,749) 2,577,523
Net cash used in operating activities (15,260,677) (17,687,250) (10,747,782)
Cash flows from investing activities:      
Proceeds from sale of marketable debt securities 10,374,593 2,000,024 1,100,000
Purchase of equity investments (499,998)
Other assets 62,694 20,909 (12,822)
Capital expenditures (949,487) (832,712) (1,033,503)
Purchases of marketable debt securities (17,624,779) (4,000,042)
Net cash (used in) provided by investing activities (8,136,979) (3,311,819) 53,675
Cash flows from financing activities:      
Sale of treasury stock, net of costs 461,723 16,904,173
Issuance of common stock, net of costs 21,335,000 2,397,618 4,147,200
Settlements of restricted stock for tax withholding obligations (198,740) (602,080)
Net cash provided by financing activities 21,335,000 2,660,601 20,449,293
Effect of exchange rate changes on cash 14,463 (190,585) (80,124)
Net (decrease) increase in cash, cash equivalents and restricted cash (2,048,193) (18,529,053) 9,675,062
Cash and cash equivalents at beginning of year 8,258,878 26,787,931 17,112,869
Cash, cash equivalents and restricted cash at end of year 6,210,685 8,258,878 26,787,931
Supplemental disclosure of cash flow information:      
Construction in progress included in accrued expenses $ 200,000 $ 168,000