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Note 8 - Retirement Plans - Target Asset Allocation (Details) | 12 Months Ended
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Dec. 31, 2016
Large Cap Value [Member] |
Target range, strategic allocation | 5.00%
Target range, lower limit | 0.00%
Target range, upper limit | 50.00%
Large Cap Blend [Member] |
Target range, strategic allocation | 5.00%
Target range, lower limit | 0.00%
Target range, upper limit | 50.00%
Large Cap Growth [Member] |
Target range, strategic allocation | 5.00%
Target range, lower limit | 0.00%
Target range, upper limit | 50.00%
Mid-cap Blend [Member] |
Target range, strategic allocation | 15.00%
Target range, lower limit | 0.00%
Target range, upper limit | 40.00%
Small Cap Core [Member] |
Target range, strategic allocation | 5.00%
Target range, lower limit | 0.00%
Target range, upper limit | 25.00%
Foreign Large Blend [Member] |
Target range, strategic allocation | 10.00%
Target range, lower limit | 0.00%
Target range, upper limit | 40.00%
Emerging Markets [Member] |
Target range, strategic allocation | 10.00%
Target range, lower limit | 0.00%
Target range, upper limit | 25.00%
Real Estate [Member] |
Target range, strategic allocation | 5.00%
Target range, lower limit | 0.00%
Target range, upper limit | 20.00%
US Treasury Securities [Member] |
Target range, strategic allocation | 5.00%
Target range, lower limit | 0.00%
Target range, upper limit | 25.00%
Intermediate Term Bond [Member] |
Target range, strategic allocation | 10.00%
Target range, lower limit | 0.00%
Target range, upper limit | 50.00%
US Government Agencies Debt Securities [Member] |
Target range, strategic allocation | 5.00%
Target range, lower limit | 0.00%
Target range, upper limit | 40.00%
High Yield Bond [Member] |
Target range, strategic allocation | 10.00%
Target range, lower limit | 0.00%
Target range, upper limit | 25.00%
Emerging Markets Bond [Member] |
Target range, strategic allocation | 10.00%
Target range, lower limit | 0.00%
Target range, upper limit | 20.00%
Money Market Funds [Member] |
Target range, strategic allocation | 0.00%
Target range, lower limit | 0.00%
Target range, upper limit | 100.00%

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- Definition Target allocation 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 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: 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=65897934&loc=d3e1928-114920 + Details
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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 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: 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=65897934&loc=d3e1928-114920 + 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=65897934&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=65897934&loc=d3e2446-114920 + Details
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