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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 25, 2022
Mar. 26, 2022
Jun. 26, 2021
Mar. 27, 2021
Jun. 25, 2022
Jun. 26, 2021
Dec. 25, 2021
Cash flows from operating activities:              
Net loss $ (5,647,189) $ (1,372,664) $ (3,848,883) $ (4,185,723) $ (7,019,853) $ (8,034,606)  
Adjustments to reconcile net loss to net cash used in operating activities:              
Depreciation and amortization         535,253 412,031  
Accretion of premium or discount on marketable debt securities         128 (3,644)  
Stock-based compensation         1,073,106 3,124,675  
Foreign currency losses (gains)         124,741 (165,086)  
Change in allowance for bad debt         (5,576) 69,120  
Write-off of excess inventory         1,454,688 424,328  
Unrealized (gains) losses on investments         (4,700,000) 9,246  
Loss on disposal of property and plant         202,670 14,950  
Deferred income taxes         71,672 64,140  
Other non-cash items         453,072 468,215  
Changes in assets and liabilities:              
Accounts receivable         6,106,734 2,624,899  
Contract assets         (3,126,437) 325,276  
Inventory         (1,892,935) (2,203,925)  
Prepaid expenses and other current assets         (393,939) (1,079,691)  
Accounts payable and accrued expenses         (3,296,577) (2,259,398)  
Billings in excess of revenue earned         (1,023,859) 608,866  
Net cash used in operating activities         (11,437,112) (5,600,604) $ (10,700,000)
Cash flows from investing activities:              
Other assets         4,337 18,958  
Capital expenditures         (604,944) (673,575)  
Equity investment purchase         (499,998)  
Proceeds from sale of marketable debt securities         1,000,000 200,000  
Purchases of marketable debt securities         (3,500,030)  
Net cash used in investing activities         (3,600,635) (454,617)  
Cash flows from financing activities:              
Sale of treasury stock, net of costs         461,723 16,360,478  
Settlements of restricted stock for tax withholding obligations         (95,613) (32,705)  
Issuance of common stock, net of costs         1,565,382  
Net cash provided by financing activities         1,931,492 16,327,773  
Effect of exchange rate changes on cash         (51,457) (25,733)  
Net (decrease) increase in cash and cash equivalents         (13,157,712) 10,246,819  
Cash and cash equivalents:              
Beginning of period   $ 26,787,931   $ 17,112,869 26,787,931 17,112,869 17,112,869
End of period $ 13,630,219   $ 27,359,688   $ 13,630,219 $ 27,359,688 $ 26,787,931