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Note 12 - Stock-based Compensation - Summary of Nonvested Options and Restricted Stock (Details) - $ / shares		1 Months Ended	12 Months Ended
		Nov. 30, 2014	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Granted, restricted stock (in shares)
Granted - weighted average grant date fair value , restricted stock (in dollars per share)
Canceled/forfeited/expired - weighted average grant date fair value, restricted stock (in dollars per share)			$ 0		$ 6.07	$ 0
Employee Stock Option [Member]
Nonvested, stock options (in shares)			12,800
Canceled/forfeited/expired, stock options (in shares)
Vested, stock options (in shares)			(12,800)
Nonvested, stock options (in shares)					12,800
Nonvested - weighted average grant date fair value, stock options (in dollars per share)			$ 6.06
Canceled/forfeited/expired - weighted average grant date fair value, stock options (in dollars per share)
Vested - weighted average grant date fair value, stock options (in dollars per share)			6.06
Nonvested - weighted average grant date fair value, stock options (in dollars per share)					$ 6.06
Restricted Stock [Member]
Nonvested, restricted stock (in shares)			7,050
Granted, restricted stock (in shares)		9,500	104,298
Canceled/forfeited/expired, restricted stock (in shares)
Vested, restricted stock (in shares)			(7,198)
Nonvested, restricted stock (in shares)			104,150		7,050
Nonvested - weighted average grant date fair value, restricted stock (in dollars per share)	[1]		$ 36.35
Granted - weighted average grant date fair value , restricted stock (in dollars per share)		$ 42.65	16.38	[1]
Canceled/forfeited/expired - weighted average grant date fair value, restricted stock (in dollars per share)	[1]
Vested - weighted average grant date fair value, restricted stock (in dollars per share)	[1]		24.85
Nonvested - weighted average grant date fair value, restricted stock (in dollars per share)	[1]		$ 17.14		$ 36.35
[1] The weighted-average grant date fair value was based on the closing price of the Company's stock on the date of the grant.

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ 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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB
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-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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X

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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+ References

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+ References

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