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Note 3 - Earnings Per Share (Detail) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 61,132 | 88,774 | 79,693 | 88,774
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit (in Dollars per share) | $ 17.55 | $ 17.55 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit (in Dollars per share) | $ 40.24 | $ 40.24 |  |
Incremental Common Shares Attributable to Share-based Payment Arrangements | 10,647 | 603 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 1,515 | 79,774 |  |
Stock Options [Member] |  |  |  |
Incremental Common Shares Attributable to Share-based Payment Arrangements | 59,617 | 9,000 |  |

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