Note 2 - Acquisition (Details) (USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Jun. 13, 2014
Note 2 - Acquisition (Details) [Line Items]
Effective Income Tax Rate Reconciliation, at Blended Tax Rate, Percent	38.29%
Business Combination, Pro Forma Information, Net Interest Income of Acquiree Since Acquisition Date, Actual	$ 21,200,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	6,200,000
Core Deposits [Member] | First National Security Company Acquisition [Member]
Note 2 - Acquisition (Details) [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		7,700,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		12 years 109 days
First National Security Company Acquisition [Member] | Parent Company [Member]
Note 2 - Acquisition (Details) [Line Items]
Payments to Acquire Businesses, Gross		50,000,000
First National Security Company Acquisition [Member] | First National Security Company [Member]
Note 2 - Acquisition (Details) [Line Items]
Payments to Acquire Businesses, Gross		24,000,000
First National Security Company Acquisition [Member]
Note 2 - Acquisition (Details) [Line Items]
Business Combination, Consideration Transferred		124,400,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares)		6,252,400
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned		50,400,000
Payments to Acquire Businesses, Gross		74,000,000
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
First National Security Company Acquisition [Member] | Changes Measurement [Member]
Note 2 - Acquisition (Details) [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		2,800,000
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Deposits		$ 366,000