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Note 6 - Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
(In thousands, except per share amounts) |  | 2012 |  |  | 2011 |  |  | 2010 |
Numerator: |  |  |  |  |  |  |  |  |
Net income |  | $ | 27,267 |  |  | $ | 24,285 |  |  | $ | 19,742 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share - weighted-average shares |  |  | 22,064 |  |  |  | 21,979 |  |  |  | 21,927 |
Effect of dilutive stock options |  |  | 86 |  |  |  | 96 |  |  |  | 104 |
Diluted earnings per common share - weighted-average shares and assumed conversions |  |  | 22,150 |  |  |  | 22,075 |  |  |  | 22,031 |
Basic earnings per common share |  | $ | 1.24 |  |  | $ | 1.10 |  |  | $ | 0.90 |
Diluted earnings per common share |  | $ | 1.23 |  |  | $ | 1.10 |  |  | $ | 0.90 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration