Annual report pursuant to Section 13 and 15(d)

Note 11 - Investment in R-NAV, LLC (Details Textual)

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Note 11 - Investment in R-NAV, LLC (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
May 31, 2016
Jul. 15, 2014
Jul. 31, 2016
Jul. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Repayments of Notes Payable         $ 59,753,740 $ 231,453 $ 30,333,333
Equity Method Investment, Payment Upon Termination of Joint Venture         110,000
Equity Method Investment, Realized Gain (Loss) on Disposal         (39,732)
Income (Loss) from Equity Method Investments         (15,159) $ (305,253)
R-NAV [Member]              
Equity Method Investment, Initial Capitalization   $ 4,000,000          
Payments to Acquire Equity Method Investments   333,334          
Equity Method Investment, Promissory Note Payable   $ 666,666          
Repayments of Notes Payable     $ 333,333 $ 333,333      
Equity Method Investment, Ownership Shares Contingently Receivable   500,000          
Equity Method Investment, Ownership Percentage   33.70%         27.30%
Equity Method Investment, Payment Upon Termination of Joint Venture $ 110,000   110,000        
Equity Method Investment, Forgiven Promissory Note, Amount 333,333   $ 333,333        
Equity Method Investment, Realized Gain (Loss) on Disposal           39,732  
Equity Method Investment, Aggregate Cost   $ 1,000,000          
Equity Method Investments 0 $ 727,000          
Income (Loss) from Equity Method Investments           15,159 $ 305,253
Equity Method Investment, Commitment to Provide Services           500,000  
Equity Method Investment, Cost of Services Provided           $ 15,000 64,000
Equity Method Investment, Remaining Commitment to Provide Services $ 383,000            
R-NAV [Member] | Common Stock [Member]              
Equity Method Investment, Ownership Shares Received   3,500,000          
Equity Method Investment, Shares Transferred Upon Termination of Joint Venture 3,500,000   3,500,000        
R-NAV [Member] | Preferred Stock [Member]              
Equity Method Investment, Ownership Shares Received   1,000,000          
Equity Method Investment, Shares Transferred Upon Termination of Joint Venture 1,500,000   1,500,000        
R-NAV [Member] | Commitment to Invest [Member]              
Other Commitment   $ 1,000,000          
R-NAV's Subsidiary 1A [Member] | Call Option [Member]              
Warrants and Rights Outstanding             $ 10,500,000
Equity Method Investments   $ 273,000