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Note 3 - Earnings Per Share (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Note 3 - Earnings Per Share (Details) [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 59,932 | 79,693 | 59,932 | 79,693 | 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 | $ 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 | $ 40.24 | $ 40.24 |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | 6,697 | 1,872 | 8,557 | 1,208 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 29,299 | 79,354 | 11,738 | 79,354 |  |
Employee Stock Option [Member] |  |  |  |  |  |
Note 3 - Earnings Per Share (Details) [Line Items] |  |  |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | 31,833 | 9,000 | 49,394 | 9,000 |  |
17.55 - 40.24 [Member] |  |  |  |  |  |
Note 3 - Earnings Per Share (Details) [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 61,132 | 88,354 | 61,132 | 88,354 |  |

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