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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 26, 2021
Mar. 27, 2021
Jun. 27, 2020
Mar. 28, 2020
Jun. 26, 2021
Jun. 27, 2020
Jun. 27, 2020
Cash flows from operating activities:              
Net loss $ (3,848,883) $ (4,185,723) $ (1,143,183) $ (3,656,991) $ (8,034,606) $ (4,800,174) $ (4,800,174)
Adjustments to reconcile net loss to net cash used in operating activities:              
Depreciation and amortization         412,031 341,743  
Accretion of premium or discount on marketable debt securities         (3,644) 4,400  
Recovery of impairment on marketable debt securities         (150,644)  
Stock-based compensation         3,124,675 320,142  
Foreign currency losses (gains)         (165,086) 186,516  
Change in allowance for bad debt         69,120 (504,432)  
Write-off of excess inventory         424,328 924,679  
Unrealized gain on investments         9,246  
Loss on disposal of plant and equipment         14,950  
Deferred income taxes         64,140 58,268  
Other non-cash items         468,215 (870)  
Changes in assets and liabilities:              
Accounts receivable         2,624,899 (113,412)  
Contract assets         325,276 (1,588,176)  
Inventory         (2,203,925) (896,783)  
Prepaid expenses and other current assets         (1,079,691) 15,507  
Accounts payable and accrued expenses         (2,259,398) (1,441,710)  
Billings in excess of revenue earned         608,866 885,641  
Net cash used in operating activities         (5,600,604) (6,759,305)  
Cash flows from investing activities:              
Other assets         18,958 266,972  
Capital expenditures         (673,575) (206,127)  
Proceeds from sale of marketable debt securities         200,000 9,296,550  
Net cash (used in) provided by investing activities         (454,617) 9,357,395  
Cash flows from financing activities:              
Paycheck protection program loan receipt         2,238,000  
Paycheck protection program loan repayment         (2,070,000)  
Sale of treasury stock, net of costs         16,360,478  
Settlements of restricted stock for tax withholding obligations         (32,705)  
Net cash provided by financing activities         16,327,773 168,000  
Effect of exchange rate changes on cash         (25,733) (18,517)  
Net increase in cash and cash equivalents         10,246,819 2,747,573  
Cash and cash equivalents:              
Beginning of period   $ 17,112,869   $ 6,029,247 17,112,869 6,029,247  
End of period $ 27,359,688   $ 8,776,820   $ 27,359,688 $ 8,776,820 $ 8,776,820