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Note 3 - Investment Securities Available-for-Sale (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Note 3 - Investment Securities Available-for-Sale (Details) [Line Items]
Debt Securities, Weighted Average Duration	3 years 328 days
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	$ 16,828,000	$ 22,560,000	$ 10,626,000
Available-for-sale Securities, Gross Realized Gains	2,500,000	116,000
Available-for-sale Securities, Gross Realized Losses	294,000	106,000
Proceeds from Sale of Available-for-sale Securities	65,700,000	17,500,000
Available-for-sale Securities Pledged as Collateral	368,500,000
Securities Holdings of any One Issuer Exceeding 10% of Shareholders' Equity	$ 0	$ 0
Debt Securities [Member] | Total Investment Securities [Member] | Investment Securities Concentration Risk [Member]
Note 3 - Investment Securities Available-for-Sale (Details) [Line Items]
Concentration Risk, Percentage	99.90%

X

- Definition

Period of time between issuance and maturity of debt securities, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Securities held by any one issuer exceeding 10% of shareholders' equity.

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

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