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Note 14 - Stock-based Compensation - Summary of Nonvested Restricted Stock (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Nonvested, stock options (in shares)	0
Granted, stock options (in shares)	0	0	0
Nonvested, stock options (in shares)		0
Restricted Stock [Member]
Nonvested, stock options (in shares)	104,150
Nonvested - weighted average grant date fair value, stock options (in dollars per share)	$ 17.14
Granted, stock options (in shares)	34,932
Granted (in dollars per share)	$ 36.35
Canceled/forfeited/expired, stock options (in shares)	(150)
Canceled/forfeited/expired - weighted average grant date fair value, stock options (in dollars per share)	$ 42.65
Vested, stock options (in shares)	(38,015)
Vested - weighted average grant date fair value, stock options (in dollars per share)	$ 18.91
Nonvested, stock options (in shares)	100,917	104,150
Nonvested - weighted average grant date fair value, stock options (in dollars per share)	$ 23.09	$ 17.14

X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

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- Definition

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

+ 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 (d)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Number of non-vested options outstanding.

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- Definition

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- Definition

Weighted average grant-date fair value of non-vested options forfeited.

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- Definition

Weighted average grant-date fair value of non-vested options outstanding.

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