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Note 6 - Share-based Compensation - Stock-settled Stock Appreciation Rights Transactions (Details) - Stock Appreciation Rights (SARs) [Member] - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Outstanding SARS (in shares)	146,504
Outstanding SARS, weighted average exercise price (in dollars per share)	$ 17.38
Granted SARS (in shares)	48,515	43,988
Granted SARS, weighted average exercise price (in dollars per share)	$ 23.59
Exercised SARS (in shares)	(12,125)	(59,364)
Exercised SARS, weighted average exercise price (in dollars per share)	$ 17.92
Outstanding SARS (in shares)	182,894
Outstanding SARS, weighted average exercise price (in dollars per share)	$ 18.99

X

- Definition

The weighted average exercise price for non-option equity instruments.

+ References

No definition available.

+ Details

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X

- Definition

The weighted average grant-date fair value of SARS exercised during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

No definition available.

+ Details

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X

- Definition

The weighted average exercise price of non-option equity instruments granted during the period.

+ References

No definition available.

+ Details

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X

- Definition

Number of non-option equity instruments exercised by 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)(2)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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X

- 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=109197908&loc=d3e5070-113901

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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=109197908&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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