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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jul. 01, 2023
Jun. 25, 2022
Cash flows from operating activities:    
Net loss $ (10,808,934) $ (7,019,853)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 387,779 535,253
Accretion of premium or discount on marketable debt securities 128
Stock-based compensation 1,385,449 1,073,106
Foreign currency losses 51,950 124,741
Change in allowance for credit losses 790,950 (5,576)
Write-off of excess inventory 292,405 1,454,688
Investment impairment (unrealized gains on investments) 2,887,893 (4,700,000)
Loss on sale of property and plant 202,670
Income taxes 78,210 71,672
Changes in other non-cash items 198,194 453,072
Changes in assets and liabilities:    
Accounts receivable (1,565,340) 6,106,734
Contract assets and unbilled receivables (96,923) (3,126,437)
Inventory (1,685,961) (1,892,935)
Prepaid expenses, other current assets and other assets (929,086) (393,939)
Accounts payable and accrued expenses 1,396,840 (3,296,577)
Contract liabilities and billings in excess of revenue earned (375,499) (1,023,859)
Net cash used in operating activities (7,992,073) (11,437,112)
Cash flows from investing activities:    
Other assets (483) 4,337
Capital expenditures (350,631) (604,944)
Equity investment purchase (499,998)
Proceeds from sale of marketable debt securities 6,466,917 1,000,000
Purchases of marketable debt securities (17,624,779) (3,500,030)
Net cash used in investing activities (11,508,976) (3,600,635)
Cash flows from financing activities:    
Sale of treasury stock, net of costs 461,723
Issuance of common stock and pre-funded warrants, net of costs 21,335,000 1,565,382
Settlements of restricted stock for tax withholding obligations (95,613)
Net cash provided by financing activities 21,335,000 1,931,492
Effect of exchange rate changes on cash 13,839 (51,457)
Net increase (decrease) in cash and cash equivalents 1,847,790 (13,157,712)
Cash and cash equivalents:    
Beginning of period 8,258,878 26,787,931
End of period $ 10,106,668 $ 13,630,219