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Note 9 - Stock-based Compensation - Phantom Stock Plan (Details) - Phantom Share Units (PSUs) [Member] - Phantom Stock Plan [Member] | 3 Months Ended
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Mar. 31, 2019 $ / shares shares
Outstanding, beginning balance (in shares) | shares | 99,313
Outstanding, beginning balance (in dollars per share) | $ / shares | $ 21.53
Granted (in shares) | shares | 8,168
Granted (in dollars per share) | $ / shares | $ 22.15
Distributions (in shares) | shares | (1,004)
Distributions (in dollars per share) | $ / shares | $ 22.01
Outstanding, ending balance (in shares) | shares | 106,477
Outstanding, ending (in dollars per share) | $ / shares | $ 21.93
Vested at March 31, 2019 (in shares) | shares | 105,935
Vested at March 31, 2019 (in dollars per share) | $ / shares | $ 21.93

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- 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, 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 Net number of non-option equity instruments granted to participants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Increase (decrease) in the number of shares under non-option equity instrument agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Details
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- Details
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