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Note 11 - Stock-Based Compensation (Details) - Phantom Stock Plan - Phantom Stock Plan [Member] | 12 Months Ended
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Dec. 31, 2015 $ / shares shares
Note 11 - Stock-Based Compensation (Details) - Phantom Stock Plan [Line Items] |
Shares | shares | 67,113
Fair Value | $ / shares | $ 20.27
Vested at December 31, 2015 | shares | 78,857
Vested at December 31, 2015 | $ / shares | $ 21.64
Granted | shares | 12,924
Granted | $ / shares | $ 19.44
Forfeited | shares | (3)
Forfeited | $ / shares | $ 20.78
Distributions | shares | (594)
Distributions | $ / shares | $ 19.82
Shares | shares | 79,440
Fair Value | $ / shares | $ 21.64

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- Definition Represents share-based compensation arrangement by share-based payment award, non option equity instruments, vested, number. + References No definition available. + Details
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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of non-option equity instruments granted to participants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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