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Note 11 - Stock-based Compensation - Phantom Stock Plan (Details) - Phantom Share Units (PSUs) [Member] - Phantom Stock Plan [Member] | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Outstanding, beginning balance (in shares) | shares | 89,339
Outstanding, beginning balance (in dollars per share) | $ / shares | $ 29.39
Granted (in shares) | shares | 8,469
Granted (in dollars per share) | $ / shares | $ 27.43
Forfeited (in shares) | shares | (10)
Forfeited (in dollars per share) | $ / shares | $ 28.95
Distributions (in shares) | shares | (8,618)
Distributions (in dollars per share) | $ / shares | $ 28.72
Outstanding, ending balance (in shares) | shares | 89,180
Outstanding, ending (in dollars per share) | $ / shares | $ 27.50
Vested at December 31, 2017 (in shares) | shares | 88,895
Vested at December 31, 2017 (in dollars per share) | $ / shares | $ 27.50

X
- Definition Represents share based compensation arrangement by share based payment award, non option equity instruments distributed, fair value. + References No definition available. + Details
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- Definition Represents share-based compensation arrangement by share based payment award non option equity instruments forfeitures fair value. + References No definition available. + Details
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X
- Definition Represents share-based compensation arrangement by share-based payment award, non-option equity instruments, granted, fair value. + References No definition available. + Details
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- Definition Represents share-based compensation arrangement by share-based payment award, non option equity instruments outstanding, fair value per share. + References No definition available. + Details
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- Definition Represents share-based compensation arrangement by share-based payment award, non option equity instruments vested, fair value. + References No definition available. + Details
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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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Other increase (decrease) in number of shares reserved for issuance under non-option equity instrument agreements that is not separately disclosed. + References No definition available. + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Details
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- Details
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