Note 9 - Fair Value Measurements and Disclosures (Details) (USD $)	6 Months Ended
	Jun. 30, 2013
Note 9 - Fair Value Measurements and Disclosures (Details) [Line Items]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount (in Dollars)	$ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount (in Dollars)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 (in Dollars)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (in Dollars)	0
Fair Value Inputs, Loss Severity	95.00%
Threshold for Identifying Banks with Trust Preferred Securities (in Dollars)	$ 15,000,000,000
Minimum Cost Saving for Refinance	2.00%
Pooled Trust Preferred Securities [Member]
Note 9 - Fair Value Measurements and Disclosures (Details) [Line Items]
Available-for-sale Securities, number	seven
Pooled Trust Preferred Securities [Member] | Minimum [Member]
Note 9 - Fair Value Measurements and Disclosures (Details) [Line Items]
Fair Value Inputs, Prepayment Rate	0.00%
Pooled Trust Preferred Securities [Member] | Maximum [Member]
Note 9 - Fair Value Measurements and Disclosures (Details) [Line Items]
Fair Value Inputs, Prepayment Rate	1.00%
Minimum [Member]
Note 9 - Fair Value Measurements and Disclosures (Details) [Line Items]
Fair Value Inputs, Loss Severity	0.00%
Fair Value Inputs, Prepayment Rate	0.00%
Fair Value Inputs, Discount Rate	4.16%
Maximum [Member]
Note 9 - Fair Value Measurements and Disclosures (Details) [Line Items]
Fair Value Inputs, Loss Severity	100.00%
Fair Value Inputs, Prepayment Rate	1.00%
Fair Value Inputs, Discount Rate	9.42%