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Note 2 - Securities Available-for-Sale (Detail) - The carrying amount of securities available-for-sale (USD $)
Dec. 31, 2012
Dec. 31, 2011
Gross Amortized Cost      
Unrealized Gains      
Unrealized Losses      
Fair Value      
Equity Securities [Member]
   
Gross Amortized Cost      
Unrealized Gains      
Unrealized Losses      
Fair Value      
Mutual Funds [Member]
   
Gross Amortized Cost      
Unrealized Gains      
Unrealized Losses      
Fair Value