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Note 20 - Segment Information (Details Textual)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
a
Sep. 30, 2017
USD ($)
a
Segment
Segment Reporting Information [Line Items]    
Number of Reportable Segments | Segment   7
Discontinued Operations [Member]    
Segment Reporting Information [Line Items]    
Overhead costs no longer absorbed by the Prosper discontinued operations | $ $ 4 $ 12
Eastman Business Park Rochester NY [Member] | Minimum [Member]    
Segment Reporting Information [Line Items]    
Area of Real Estate Property | a 1,200 1,200