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Note 3 - Equity and Cost Method Investments and Related Commitments and Contingent Liabilities, Including Guarantees (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
a
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 1992
a
Operating Leases, Rent Expense, Total $ 7,500 $ 7,500        
Equity Method Investments 992,579       $ 991,094  
Cost Method Investments 1,682,031       1,633,300  
Notes, Loans and Financing Receivable, Net, Current, Total $ 175,000       175,000  
OKC Industrial Properties [Member]            
Area of Land | a 46         260
Broadway Sixty-Eight Partnership [Member]            
Equity Method Investment, Ownership Percentage 33.00%          
Equity Method Investments $ 191,093       171,243  
Grand Woods Development, LLC [Member]            
Equity Method Investment, Ownership Percentage 47.00%          
Equity Method Investments $ 528,218       544,603  
Area of Real Estate Property | a 26.3          
QSN Office Park [Member]            
Equity Method Investment, Ownership Percentage 20.00%          
Equity Method Investments $ 273,268       275,248  
OKC Industrial Properties [Member]            
Cost Method Investment, Ownership Percentage 10.00%          
Cost Method Investments $ 56,164       56,164  
Bailey [Member]            
Cost Method Investment, Ownership Percentage 10.00%          
Cost Method Investments $ 80,377       80,377  
Cloudburst Solutions [Member]            
Cost Method Investment, Ownership Percentage 10.62%          
Cost Method Investments $ 1,294,375       1,250,000  
Payments to Acquire Interest in Subsidiaries and Affiliates, Total 44,375   $ 750,000 $ 500,000    
Notes, Loans and Financing Receivable, Net, Current, Total $ 175,000          
Ocean [Member]            
Cost Method Investment, Ownership Percentage 12.44%          
Cost Method Investments $ 210,800       $ 206,444