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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 28, 2026
Mar. 29, 2025
Cash flows from operating activities:    
Net loss $ (3,752,038) $ (3,113,533)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation and amortization 247,023 219,501
Stock-based compensation 495,328 774,392
Non-cash (gain) loss on equity investments (2,530,102) 24,000
Income taxes 57,020 52,228
Foreign currency gains (96,687) (65,901)
Noncash provision for excess inventory 71,587 551,758
Changes in assets and liabilities:    
Accounts receivable 7,213,292 4,775,817
Contract assets (677,216) (2,273,850)
Inventory 456,375 (444,726)
Prepaid expenses and other current assets (11,653) (773,832)
Other assets 198,624
Accounts payable and accrued expenses 1,497,396 (2,953,405)
Accrued warranty (1,123,846) (122,389)
Contract liabilities (167,222) (64,261)
Deferred grant income (2,688,627)
Net cash used in operating activities (810,746) (3,414,201)
Cash flows from investing activities:    
Proceeds from sale of marketable securities 20,243,677
Other assets (17)
Capital expenditures (1,301,349) (500,492)
Purchases of marketable securities (15,156,585)
Net cash (used in) from investing activities (1,301,349) 4,586,583
Cash flows from financing activities:    
Payment of dividends (29,167)
Net cash provided by financing activities (29,167)
Effect of exchange rate changes on cash 1,052 (588)
Net change in cash, cash equivalents and restricted cash (2,140,210) 1,171,794
Cash, cash equivalents and restricted cash at beginning of year 61,627,146 15,210,120
Cash, cash equivalents and restricted cash at end of year 59,486,936 16,381,914
Supplemental disclosure of cash flow information:    
Interest paid, net of amounts capitalized
Cash paid for income taxes
Accrued dividends $ 35,000