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Note 6 - Changes in Accumulated Other Comprehensive Income by Component (Detail) - Reclassifcation out of component of accumulated other comprehensive income: (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Realized gain and loss on available-for sale securities $ 486,000 $ 460,000
Total before tax (307,000) (299,000)
Amounts Reclassified From OCI [Member]
    
Realized gain and loss on available-for sale securities 482,000 460,000
Total before tax 482,000 460,000
Income tax expense (175,000) (161,000)
Total reclassification related to available-for-sale securities 307,000 299,000
Realized gain and loss on cash flow hedges 26,000 (3,000)
Total before tax 26,000 (3,000)
Income tax benefit (expense) (9,000) 1,000
Total reclassification related to cash flow hedges $ 17,000 $ (2,000)