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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Cash flows from operating activities:    
Net loss $ (4,800,174) $ (15,556,934)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 341,743 438,294
Accretion of premium or discount on marketable debt securities 4,400
Recovery of impairment on marketable debt securities (150,644)
Stock-based compensation 320,142 1,354,316
Foreign currency losses (gains) 186,516 (73,231)
Change in allowance for bad debt (504,432) 330,172
Write-off of excess inventory 924,679 2,406,492
Unrealized gain on investments (768,000)
Loss on disposal of plant and equipment 251,291
Deferred income taxes 58,268 52,518
Other non-cash items (870) (19,631)
Changes in assets and liabilities:    
Accounts receivable (113,412) (2,144,699)
Contract assets (1,588,176) 1,867,058
Inventory (896,783) (1,309,827)
Prepaid expenses and other current assets 15,507 418,317
Accounts payable and accrued expenses (1,441,710) 304,955
Billings in excess of revenue earned 885,641 1,070,129
Net cash used in operating activities (6,759,305) (11,378,780)
Cash flows from investing activities:    
Other assets 266,972 (100,810)
Capital expenditures (206,127) (119,815)
Proceeds from sale of marketable debt securities 9,296,550 3,789,139
Cash paid for equity investment (2,500,000)
Net cash provided by investing activities 9,357,395 1,068,514
Cash flows from financing activities:    
Paycheck protection program loan receipt 2,238,000
Paycheck protection program loan repayment (2,070,000)
Sale of registered stock 8,128,531
Settlements of restricted stock for tax withholding obligations (7,128)
Net cash provided by (used in) financing activities 168,000 8,121,403
Effect of exchange rate changes on cash (18,517) (2,958)
Net increase (decrease) in cash and cash equivalents 2,747,573 (2,191,821)
Cash and cash equivalents:    
Beginning of period 6,029,247 14,326,347
End of period 8,776,820 12,134,526
Supplemental disclosure of cash flow information:    
Issuance costs included in accounts payable and accrued expenses 90,000
Cash paid for interest $ 1,495