Note 5 - Fair Value Consideration (Details Textual) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
|Financial Instruments, Owned, at Fair Value||$ 0||$ 0|
The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.
Reference 1: http://www.xbrl.org/2003/role/presentationRef