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Note 3 - Trading Account Assets (Details) - Net Realized and Change in Net Unrealized Gains on Trading Account Assets (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Realized and Change in Net Unrealized Gains on Trading Account Assets [Abstract]
Realized gains, net	$ 75	$ 13	$ 421	$ 13
Unrealized gains, net due to changes in fair value relative to assets held at end of period	23	23	23	23
Total trading account income, net	$ 98	$ 36	$ 444	$ 36

Amount of gain (loss) resulting from the difference between the acquisition price and the selling price or fair value of trading assets and trading liabilities, conducted separately from customer trading activities. Includes, but is not limited to, changes in fair value of trading assets and trading liabilities.

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