Note 3 - Trading Account Assets (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
Jan. 31, 2015	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Trading Securities, Cost		$ 5.0us-gaap_TradingSecuritiesCost
Payments to Acquire Trading Securities Held-for-investment	$ 4.5

The cash outflow to acquire securities classified as trading securities and held for investment purposes. Excludes payments for trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

No definition available.

Name:	us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration