Note 3 - Trading Account Assets (Details) - Summary of 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, 2013	Sep. 30, 2013
Gain (Loss) on Investments [Line Items]
Realized gains, net	$ 13
Unrealized gains, net due to changes in fair value relative to assets held at end of period	23
Total trading account gains, net	36	36
Trading, Municipal Bonds [Member]
Gain (Loss) on Investments [Line Items]
Realized gains, net	13
Unrealized gains, net due to changes in fair value relative to assets held at end of period	23
Total trading account gains, net	36
Trading, Insured Bank Deposits [Member]
Gain (Loss) on Investments [Line Items]
Realized gains, net	0
Unrealized gains, net due to changes in fair value relative to assets held at end of period	0
Total trading account gains, net	$ 0