Note 20 - Segment Information (Details Textual) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2017 a Segment	Jun. 30, 2016 USD ($)
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		$ 8
Eastman Business Park Rochester NY [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Area of Real Estate Property | a		1,200