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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Cash flows from operating activities:    
Net loss $ (4,185,723) $ (3,656,991)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 205,023 170,805
Accretion of premium or discount on marketable debt securities 1,534 2,344
Stock-based compensation 2,610,166 158,465
Foreign currency losses (gains) (68,351) 193,073
Change in allowance for bad debt 95,931 (150,500)
Write-off of excess inventory 408,939 676,063
Other non-cash items 412,161 (985)
Changes in assets and liabilities:    
Accounts receivable 1,258,770 260,602
Contract assets 2,406,334 (473,551)
Inventory (1,398,350) (356,766)
Prepaid expenses and other current assets (773,067) (33,168)
Accounts payable and accrued expenses (934,132) (1,086,534)
Billings in excess of revenue earned (284,515) 428,688
Net cash used in operating activities (245,280) (3,868,455)
Cash flows from investing activities:    
Other assets 55,231
Capital expenditures (346,450) (155,930)
Proceeds from sale of marketable debt securities 200,000 6,297,500
Net cash (used in) provided by investing activities (146,450) 6,196,801
Cash flows from financing activities:    
Sale of treasury stock, net of costs 15,520,084
Settlements of restricted stock for tax withholding obligations (32,705)
Net cash provided by financing activities 15,487,379
Effect of exchange rate changes on cash (5,207) (23,990)
Net increase in cash and cash equivalents 15,090,442 2,304,356
Cash and cash equivalents:    
Beginning of period 17,112,869 6,029,247
End of period $ 32,203,311 $ 8,333,603