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Note 2 - Investment Securities (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Number of Securities	444
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	114
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (in Dollars)	$ (5,664)	$ (23,469)	$ 5,664
Unrealized Losses 12 Months or Greater [Member]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions			1

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired.

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