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Note 8 - Notes Payable (Details Textual) - USD ($)
3 Months Ended
Jul. 09, 2019
Jul. 05, 2018
Jun. 03, 2016
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Jul. 01, 2016
Payments to Acquire Businesses, Gross       $ 9,400,000    
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  
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          
Director [Member] | Roundball LLC [Member] | Convertible Notes Payable [Member]              
Interest Expense, Debt, Total       $ 0 $ 34,000