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Note 8 - Notes Payable (Details Textual)
Dec. 29, 2018
USD ($)
Jul. 05, 2018
USD ($)
$ / shares
Jul. 01, 2018
USD ($)
Jun. 03, 2016
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 01, 2016
USD ($)
Dec. 30, 2012
$ / shares
shares
Dec. 30, 2011
USD ($)
Line of Credit Facility, Fair Value of Amount Outstanding         $ 200,000 $ 200,000      
CAD Enterprises, Inc. [Member]                  
Debt Instrument, Face Amount     $ 9,000,000            
Business Combination, Consideration Transferred, Total   $ 21,000,000 21,000,000            
Payments to Acquire Businesses, Gross   $ 12,000,000 $ 12,000,000            
Promissory Note 1 [Member]                  
Debt Instrument, Face Amount             $ 2,000,000    
Promissory Note 2 [Member]                  
Debt Instrument, Face Amount             2,768,662    
Seller Note [Member] | CAD Enterprises, Inc. [Member]                  
Debt Instrument, Interest Rate, Stated Percentage   4.00%              
Roundball LLC [Member] | Amendment No. 7 [Member]                  
Working Capital Funding $ 467,000                
Line of Credit Facility, Maximum Borrowing Capacity $ 250,000                
Debt Instrument, Interest Rate, Stated Percentage 0.34%                
Roundball LLC [Member] | Amendment No. 7 [Member] | Common Class B [Member]                  
Debt Instrument, Convertible, Number of Equity Instruments 75,000                
Roundball LLC [Member] | Amendment No. 1 [Member] | Warrant to Purchase Class A Common Stock [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares               100,000  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares               $ 2.50  
First Francis [Member] | Revolving Credit Facility [Member]                  
Line of Credit Facility, Interest Rate During Period       4.00%          
First Francis [Member] | Promissory Note 1 [Member]                  
Debt Instrument, Face Amount             2,000,000    
First Francis [Member] | Promissory Note 2 [Member]                  
Debt Instrument, Interest Rate, Stated Percentage   6.25%              
Debt Instrument, Face Amount             $ 2,768,662    
First Francis [Member] | Common Class B [Member] | Promissory Note 2 [Member]                  
Debt Instrument, Convertible Option, Maximum Debt Convertible   $ 648,000              
Debt Instrument, Convertible, Stock Price Trigger | $ / shares   $ 6.48              
Director [Member] | Roundball LLC [Member] | Convertible Notes Payable [Member]                  
Working Capital Funding                 $ 467,000
Line of Credit Facility, Maximum Borrowing Capacity                 $ 250,000
Debt Instrument, Interest Rate, Stated Percentage                 0.25%