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Note 7 - Share-based Compensation - RSU and PSA Activity (Details) - Restricted Stock Units and Performance Stock Awards [Member]	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Unvested RSUs and PSAs (in shares) | shares	169,583	[1]
Unvested RSUs and PSAs (in dollars per share) | $ / shares	$ 9.50
PSAs granted (in shares) | shares	43,077	[1]
PSAs granted (in dollars per share) | $ / shares	$ 19.97
Unvested PSAs canceled (in shares) | shares	(3,085)	[1]
Unvested PSAs canceled (in dollars per share) | $ / shares	$ 19.97
RSUs vested (in shares) | shares	(169,583)	[1]
RSUs vested (in dollars per share) | $ / shares	$ 9.50
Unvested PSAs as of June 30, 2018 (in shares) | shares	39,992	[1]
Unvested PSAs as of June 30, 2018 (in dollars per share) | $ / shares	$ 19.97
[1] The number of performance share awards disclosed in this table are at the target level of 100%.

X

- Definition

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

+ References

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-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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X

- Definition

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.

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X

- Definition

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).

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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).

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- 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

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X

- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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