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Note 15 - Fair Value of Financial Instruments (Details Textual)
 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Port Jefferson Professional Park [Member]        
Liquidation Basis of Accounting Change in Liquidation Value of Real Estate $ 221,000      
Liquidation Basis of Accounting, Value in Excess of Estimated Fair Value $ 15,000 $ 206,000    
Number of Real Estate Properties that Appreciated in Value 2      
The Grove, Florida [Member]        
Equity Method Investments $ 0 $ 0 $ 0 $ 0
Deferred Tax Liabilities, Net       $ 1,315,000
Taxes Payable, Current     618,000  
Income Tax Expense (Benefit)     $ (697,000)  
Appraisal Process, Related Fees 1,968,750      
Loans Payable 2,700,000      
Proceeds from Principal Repayments on Loans and Leases Held-for-investment 643,609      
Liquidation Basis of Accounting Change in Liquidation Value of Real Estate [1] $ 221,000      
[1] The net increase in value of $221,000 is attributable to an increase in value from the sale of the Fairfax Medical Center at $15,000 in excess of the estimated value and the sale of two buildings in the Port Jefferson Professional Park at $206,000 in excess of the estimated value at December 31, 2015. The combined net increase of $221,000 represents the net increase in value of the real estate compared to that which was reported in the Statement of Net Assets at December 31, 2015.