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Note 11 - 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								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Impact per basic share	$ (2.42)us-gaap_EarningsPerShareBasic	$ 0.14us-gaap_EarningsPerShareBasic	$ 0.32us-gaap_EarningsPerShareBasic	$ 0.25us-gaap_EarningsPerShareBasic	$ (0.12)us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ (1.71)us-gaap_EarningsPerShareBasic	$ 0.69us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic
Impact per diluted share	$ (2.42)us-gaap_EarningsPerShareDiluted	$ 0.14us-gaap_EarningsPerShareDiluted	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.25us-gaap_EarningsPerShareDiluted	$ (0.12)us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.47us-gaap_EarningsPerShareDiluted	$ (1.71)us-gaap_EarningsPerShareDiluted	$ 0.69us-gaap_EarningsPerShareDiluted	$ 0.21us-gaap_EarningsPerShareDiluted
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
RSU expense before taxes									$ 1,252us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	$ 936us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	$ 1,238us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
RSU expense after taxes									$ 774us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	$ 554us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	$ 278us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Impact per basic share									$ 0.07us-gaap_EarningsPerShareBasic / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	$ 0.05us-gaap_EarningsPerShareBasic / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	$ 0.03us-gaap_EarningsPerShareBasic / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Impact per diluted share									$ 0.07us-gaap_EarningsPerShareDiluted / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	$ 0.05us-gaap_EarningsPerShareDiluted / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	$ 0.03us-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.

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