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Note 8 - Equity Plans (Details) - Stock Based Compensation Expense Recognized on Restricted Stock Units (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Impact per basic share	$ 0.10us-gaap_EarningsPerShareBasic	$ 0.25us-gaap_EarningsPerShareBasic
Impact per diluted share	$ 0.10us-gaap_EarningsPerShareDiluted	$ 0.25us-gaap_EarningsPerShareDiluted
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
RSU expense before taxes	$ 231us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	$ 253us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
RSU expense after taxes	$ 141us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	$ 157us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Impact per basic share	$ 0.01us-gaap_EarningsPerShareBasic / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	$ 0.01us-gaap_EarningsPerShareBasic / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Impact per diluted share	$ 0.01us-gaap_EarningsPerShareDiluted / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	$ 0.01us-gaap_EarningsPerShareDiluted / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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X

- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

+ Details

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X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



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-Name Regulation S-X (SX)

-Number 210

-Section 04

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X

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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- Details

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