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Note 9 - Retirement Plans (Detail) - Target asset allocation | 12 Months Ended
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Dec. 31, 2012
Large Cap Equities [Member] |
Asset class: |
Target Plan Asset Allocations Range Minimum | 23.00%
Target Plan Asset Allocations Range Maximum | 91.00%
Mid Cap Equities [Member] |
Asset class: |
Target Plan Asset Allocations Range Minimum | 0.00%
Target Plan Asset Allocations Range Maximum | 15.00%
Small Cap Equities [Member] |
Asset class: |
Target Plan Asset Allocations Range Minimum | 0.00%
Target Plan Asset Allocations Range Maximum | 16.00%
International Equities [Member] |
Asset class: |
Target Plan Asset Allocations Range Minimum | 5.00%
Target Plan Asset Allocations Range Maximum | 25.00%
Fixed Income Securities [Member] |
Asset class: |
Target Plan Asset Allocations Range Minimum | 0.00%
Target Plan Asset Allocations Range Maximum | 30.00%
Cash [Member] |
Asset class: |
Target Plan Asset Allocations Range Minimum | 0.00%
Target Plan Asset Allocations Range Maximum | 20.00%

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- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 + Details
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- Definition Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 + Details
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