Note 8 - Equity Plans (Details) - Restricted Stock Unit Activity (Restricted Stock Units (RSUs) [Member], USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	9 Months Ended
Jan. 02, 2013	Sep. 30, 2013	Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Note 8 - Equity Plans (Details) - Restricted Stock Unit Activity [Line Items]
Outstanding, Number of Shares		230,160	192,819
Outstanding, Weighted Average Exercise Price (in Dollars per share)		$ 25.43	$ 26.22
Outstanding, Aggregate Intrinsic value (in Dollars)		$ 768
Vested at September 30, 2013		173,344
Vested at September 30, 2013 (in Dollars per share)		$ 25.98
Vested at September 30, 2013 (in Dollars)		$ 558
Granted	1,800	37,341
Granted (in Dollars per share)		$ 21.33
Converted into shares		0
Converted into shares (in Dollars per share)		$ 0
Forfeited		0
Forfeited (in Dollars per share)		$ 0

Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

No definition available.

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- Definition

Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

+ References

No definition available.

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- 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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- 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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- 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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- Definition

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

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- 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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- Definition

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

+ References

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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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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ 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)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-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=6415400&loc=d3e5070-113901

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average granted price of RSU's converted into shares.

+ References

No definition available.

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