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Note 6 - Earnings Per Common Share | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Text Block] | 6. Earnings Per Common Share Basic and diluted earnings per common share were computed as follows:
(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 |
Options totaling 465,150, 372,900 and 351,000 shares were outstanding but were not included in the calculation of diluted earnings per share for 2012, 2011 and 2010, respectively, because including the options in the denominator would be antidilutive, or decrease the number of weighted-average shares, due to their exercise prices exceeding the average market price of the common shares or due to inclusion of average unrecognized compensation expense in the calculation. Performance-based option awards totaling 107,000 shares in 2010 were also not included in the calculation of diluted earnings per share because the performance condition was not met. Unvested performance unit awards (see Note 9) totaling 43,600, 46,180 and 29,164 shares for 2012, 2011 and 2010, respectively, were considered outstanding but were not included in the calculation of diluted earnings per share because inclusion of average unrecognized compensation expense in the calculation would cause the performance units to be antidilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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