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Note 9 - Related Party Relations and Transactions (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Sep. 13, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2016
Jul. 27, 2016
Monthly Costs for Overhead Items $ 5,000          
Boca Equity Partners LLC [Member]            
Line of Credit Facility, Maximum Borrowing Capacity           $ 250,000
Line of Credit Facility, Interest Rate at Period End           10.00%
Notes Payable, Related Parties, Current         $ 471,826  
Long-term Line of Credit, Total   $ 0        
Related Party Transaction, Expenses from Transactions with Related Party   $ 15,000 $ 45,000      
International Rail Partners LLC [Member] | Billed Amount for Compensation and Expenses [Member]            
Related Party Transaction, Amounts of Transaction     $ 57,244 $ 125,090    
Board of Directors, Officers, and Officers of Subsidiary [Member]            
Common Stock, Shares, Outstanding, Ending Balance   838,060   838,060    
Percentage of Outstanding of Common Stock   32.10%   32.10%    
Marino Family Holdings LLC [Member]            
Common Stock, Shares, Outstanding, Ending Balance   351,966   351,966    
Banyan Rail Holdings LLC [Member]            
Common Stock, Shares, Outstanding, Ending Balance   91,348   91,348    
Chief Executive Officer [Member] | Patriot Equity LLC [Member]            
Noncontrolling Interest, Ownership Percentage by Parent   100.00%        
Chief Executive Officer [Member] | Banyan Medical Partners LLC [Member] | Patriot Equity LLC [Member]            
Noncontrolling Interest, Ownership Percentage by Parent   100.00%