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Note 8 - Notes Payable (Details Textual) - USD ($)
Jun. 03, 2016
Mar. 31, 2018
Dec. 31, 2017
Dec. 29, 2016
Dec. 30, 2012
Dec. 30, 2011
Line of Credit Facility, Fair Value of Amount Outstanding   $ 200,000 $ 200,000      
Roundball LLC [Member] | Amendment No. 5 [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. 1 [Member] | Warrant to Purchase Class A Common Stock [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights         100,000  
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 2.50  
First Francis [Member] | Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity $ 250,000          
Line of Credit Facility, Interest Rate During Period 4.00%          
Line of Credit Facility, Maximum Borrowing Capacity, Percentage of Accounts Receivable 80.00%          
Long-term Line of Credit, Total   $ 0 $ 0      
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%