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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 25, 2021
Dec. 26, 2020
Cash flows from operating activities:      
Net loss $ (19,326,265) $ (13,468,371) $ (4,530,925)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 722,024 668,691 651,083
Accretion of premium or discount on marketable debt securities 128 7,517 7,762
Stock-based compensation 1,267,705 4,417,422 821,122
Net (gain) loss on investment transactions (2,700,000) (300,000) 29,356
Income taxes 143,345 128,279 116,536
Foreign currency losses (gains) 449,443 (186,942) (289,471)
Loss on sale of property and plant 317,032 99,228
Change in allowance for bad debt 162,638 (26,704) (763,159)
Write-off of excess inventory 2,078,750 588,175 667,019
Change in warranty reserves 2,329,000 9,552 (1,172)
Changes in assets and liabilities:      
Accounts receivable 6,806,578 (3,364,990) (2,954,703)
Contract assets and unbilled receivables (1,835,518) 1,379,436 (2,600,671)
Inventory (2,010,749) (2,728,404) (1,332,139)
Prepaid expenses, other current assets and other assets 908,156 (691,573) (160,371)
Accounts payable and accrued expenses (3,859,768) 143,379 5,227,011
Contract liabilities and billings in excess of revenue earned (3,139,749) 2,577,523 695,565
Net cash used in operating activities (17,687,250) (10,747,782) (4,417,157)
Cash flows from investing activities:      
Proceeds from sale of marketable debt securities 2,000,024 1,100,000 12,148,117
Purchase of equity investments (499,998)
Other assets 20,909 (12,822) 193,186
Capital expenditures (832,712) (1,033,503) (542,862)
Purchases of marketable debt securities (4,000,042)
Net cash (used in) provided by investing activities (3,311,819) 53,675 11,798,441
Cash flows from financing activities:      
Sale of treasury stock, net of costs 461,723 16,904,173 3,829,462
Issuance of common stock, net of costs 2,397,618 4,147,200
Settlements of restricted stock for tax withholding obligations (198,740) (602,080) (139,926)
Net cash provided by financing activities 2,660,601 20,449,293 3,689,536
Effect of exchange rate changes on cash (190,585) (80,124) 12,802
Net (decrease) increase in cash and cash equivalents (18,529,053) 9,675,062 11,083,622
Cash and cash equivalents at beginning of year 26,787,931 17,112,869 6,029,247
Cash and cash equivalents at end of year 8,258,878 26,787,931 17,112,869
Supplemental disclosure of cash flow information:      
Construction in progress included in accrued expenses $ 168,000 $ 257,000