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Financial Instruments (Fair Value Measurements) (Details) - USD ($)
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Payments to Acquire Equity Method Investments $ 2,500,000 $ 1,000,000.0    
Fair value measurements of financial assets 26,319,403 43,097,888    
SOLOS Equity Raise $ 7,500,000      
Total Ownership Percentage by Other Owners 80.00%      
Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets $ 6,415,958 14,614,373    
Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 15,752,997 22,918,016    
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 4,150,448 5,565,499    
Cash and Cash Equivalents [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 6,029,247 14,326,347    
Cash and Cash Equivalents [Member] | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 6,029,247 14,326,347    
Cash and Cash Equivalents [Member] | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 0 0    
Equity Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 4,537,159 5,853,525    
Equity Securities [Member] | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 386,711 288,026    
Equity Securities [Member] | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 0 0    
Equity Securities [Member] | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (3,915,051)      
Fair value measurements of financial assets 4,150,448 5,565,499    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) 2,500,000      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0      
US Government Agencies Debt Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 8,296,870 12,810,923    
US Government Agencies Debt Securities [Member] | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 0 0    
US Government Agencies Debt Securities [Member] | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 8,296,870 12,810,923    
US Government Agencies Debt Securities [Member] | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 0 0    
Corporate Debt Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 7,456,127 10,107,093    
Corporate Debt Securities [Member] | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 7,456,127 10,107,093    
Corporate Debt Securities [Member] | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurements of financial assets 0 0    
SOLOS [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Percentage Owned of an Equity Investment       20.00%
Equity Securities [Member] | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 100,000 300,000    
Fair value measurements of financial assets $ 3,600,000      
Percentage Owned of an Equity Investment 11.00%      
RealWear, Inc. [Member] | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 800,000 $ 100,000 $ 2,000,000.0  
Impairment of Equity Security $ 5,200,000      
Percentage Owned of an Equity Investment 2.80%      
RealWear, Inc. [Member] | RealWear, Inc. [Member] | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Ownership Percentage in Equity Investment, Warrant     15.00%  
SOLOS [Member] | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 600,000      
Fair value measurements of financial assets $ 600,000