Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
Sep. 26, 2020	Sep. 28, 2019
Cash flows from operating activities:
Net loss	$ (5,768,943)	$ (22,062,298)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	474,437	597,091
Accretion of premium or discount on marketable debt securities	6,183
Recovery of impairment on marketable debt securities	(150,644)
Stock-based compensation	638,750	1,805,999
Foreign currency (gains) losses	(9,334)	32,483
Change in allowance for bad debt	(667,983)	(56,997)
Unrealized gain on investments		(768,000)
Deferred income taxes	87,402	78,777
Loss on disposal of plant and equipment		487,284
Impairment of goodwill		331,344
Write-off of inventory	1,034,515	2,682,397
Other non-cash items	(1,067)	94,444
Changes in assets and liabilities:
Accounts receivable	185,118	(1,786,687)
Contract assets	(663,089)	2,043,724
Inventory	(1,277,017)	(1,338,233)
Prepaid expenses and other current assets	(735,565)	436,575
Accounts payable and accrued expenses	795,675	(427,603)
Billings in excess of revenue earned	(224,582)	1,034,608
Net cash used in operating activities	(6,276,144)	(16,815,092)
Cash flows from investing activities:
Other assets	374,886	(106,524)
Capital expenditures	(294,595)	(113,009)
Proceeds from sale of marketable debt securities	10,798,117	5,954,139
Cash paid for equity investment		(2,500,000)
Net cash provided by investing activities	10,878,408	3,234,606
Cash flows from financing activities:
Paycheck protection program loan receipt	2,238,000
Paycheck protection program loan repayment	(2,238,000)
Sale of registered stock		8,038,531
Settlements of restricted stock for tax withholding obligations		(7,128)
Net cash provided by financing activities		8,031,403
Effect of exchange rate changes on cash	(7,005)	(19,565)
Net increase (decrease) in cash and cash equivalents	4,595,259	(5,568,648)
Cash and cash equivalents:
Beginning of period	6,029,247	14,326,347
End of period	$ 10,624,506	$ 8,757,699

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