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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 25, 2021
Mar. 27, 2021
Sep. 26, 2020
Mar. 28, 2020
Sep. 25, 2021
Sep. 26, 2020
Sep. 26, 2020
Cash flows from operating activities:              
Net loss $ (2,128,683) $ (4,185,723) $ (968,769) $ (3,656,991) $ (10,163,289) $ (5,768,943) $ (5,768,943)
Adjustments to reconcile net loss to net cash used in operating activities:              
Depreciation and amortization         566,092 474,437  
Accretion of premium or discount on marketable debt securities         6,559 6,183  
Recovery of impairment on marketable debt securities         (150,644)  
Stock-based compensation         3,766,859 638,750  
Foreign currency gains         (174,213) (9,334)  
Change in allowance for bad debt         70,552 (667,983)  
Write-off of excess inventory         492,230 1,034,515  
Loss on disposal of plant and equipment         71,400  
Deferred income taxes         96,210 87,402  
Other non-cash items         6,861 (1,067)  
Changes in assets and liabilities:              
Accounts receivable         2,148,942 185,118  
Contract assets         617,191 (663,089)  
Inventory         (2,772,548) (1,277,017)  
Prepaid expenses and other current assets         (765,430) (735,565)  
Accounts payable and accrued expenses         (2,938,795) 795,675  
Billings in excess of revenue earned         (82,850) (224,582)  
Net cash used in operating activities         (9,054,229) (6,276,144)  
Cash flows from investing activities:              
Other assets         (9,309) 374,886  
Capital expenditures         (865,417) (294,595)  
Proceeds from sale of marketable debt securities         200,000 10,798,117  
Net cash (used in) provided by investing activities         (674,726) 10,878,408  
Cash flows from financing activities:              
Paycheck protection program loan receipt         2,238,000  
Paycheck protection program loan repayment         (2,238,000)  
Settlements of restricted stock for tax withholding obligations         (32,705)  
Issuance of common stock, net of costs         21,051,373  
Net cash provided by financing activities         21,018,668  
Effect of exchange rate changes on cash         (52,784) (7,005)  
Net increase in cash and cash equivalents         11,236,929 4,595,259  
Cash and cash equivalents:              
Beginning of period   $ 17,112,869   $ 6,029,247 17,112,869 6,029,247  
End of period $ 28,349,798   $ 10,624,506   $ 28,349,798 $ 10,624,506 $ 10,624,506