Discontinued Operations Discontinued Operations Assets and Liabilities Table (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2016
Assets held for sale	$ 1,330,000			$ 5,188,000
Dividends paid to noncontrolling interest	816,000	$ 816,000	$ 0
Oppenheimer Multi Family Housing And Healthcare Finance [Member]
Securities owned	562,000			3,560,000
Other assets	768,000			1,628,000
Assets held for sale	1,330,000			5,188,000
Accounts payable and other liabilities	1,421,000			$ 1,217,000
Interest	3,000		337,000
Principal transactions, net	0		(5,087,000)
Other (1)	995,000		8,488,000
Total revenue	998,000		3,738,000
Compensation and related expenses	11,000		2,918,000
Communications and technology	8,000		101,000
Occupancy and equipment costs	0		75,000
Interest	0		221,000
Other	3,000		1,080,000
Total expenses	22,000		4,395,000
Income (loss) before income taxes	976,000		(657,000)
Income (loss) attributable to noncontrolling interest before income taxes	159,000		(107,000)
Cash provided by operating activities	4,649,000		4,143,000
Cash provided by investing activities	0		1,000
Cash used in financing activities	(10,035,000)		(62,000)
Net (decrease) increase in cash and cash equivalents	(5,386,000)		$ 4,082,000
Cash dividends paid to parent company	4,200,000
Dividends paid to noncontrolling interest	816,000
Payments for repurchase of convertible preferred stock	$ 5,000,000