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Note 9 - Notes Payable (Details Textual) - USD ($)
9 Months Ended
Jul. 09, 2019
Jul. 05, 2018
Jul. 01, 2018
Jun. 03, 2016
Sep. 30, 2020
Sep. 30, 2019
Jun. 04, 2020
Dec. 31, 2019
Jul. 01, 2016
Payments to Acquire Businesses, Gross         $ 9,400,000 $ 50,001      
CAD Enterprises, Inc. [Member]                  
Business Combination, Consideration Transferred, Total     $ 21,000,000            
Payments to Acquire Businesses, Gross     $ 12,000,000            
Conversion of Promissory Note 2 Due to First Francis into Class B Common Stock [Member]                  
Debt Conversion, Original Debt, Amount $ 648,000                
Debt Conversion, Converted Instrument, Shares Issued (in shares) 100,000                
Seller Note [Member] | CAD Enterprises, Inc. [Member]                  
Debt Instrument, Interest Rate, Stated Percentage     4.00%            
Seller Note [Member] | Notes Payable [Member]                  
Debt Instrument, Face Amount         9,000,000     $ 9,000,000  
Paycheck Protection Program CARES Act [Member] | Notes Payable [Member] | Federal Hose [Member]                  
Debt Instrument, Face Amount         253,071   $ 253,071  
Paycheck Protection Program CARES Act [Member] | Notes Payable [Member] | CAD Enterprises, Inc. [Member]                  
Debt Instrument, Face Amount         1,200,766   $ 1,200,766  
First Francis [Member] | Related Party Notes, One [Member] | Notes Payable [Member]                  
Debt Instrument, Face Amount         2,000,000     2,000,000 $ 2,000,000
First Francis [Member] | Related Party Notes, Two [Member] | Notes Payable [Member]                  
Debt Instrument, Face Amount         $ 2,768,662     $ 2,768,662 $ 2,768,662
First Francis [Member] | Related Party Notes [Member] | Notes Payable [Member]                  
Debt Instrument, Interest Rate, Stated Percentage   6.25%              
Line of Credit Facility, Interest Rate During Period       4.00%          
Debt Instrument, Convertible Option, Maximum Debt Convertible   $ 648,000              
Debt Instrument, Convertible, Stock Price Trigger (in dollars per share)   $ 6.48