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Note 10 - Equity Method Investment (Details) - TEL’s Summarized Financial Information - Income Statement (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
TEL’s Summarized Financial Information - Income Statement [Abstract]
Revenue	$ 90,197us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue	$ 58,484us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue	$ 53,459us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Operating Expenses	79,771us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	50,878us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	48,382us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCostOfSales
Operating Income	10,426us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems	7,606us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems	5,077us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems
Net Income	$ 7,564us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	$ 5,643us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	$ 3,850us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss

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- Definition

The amount of the cost of sales reported by an equity method investment of the entity.

+ References

No definition available.

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- Definition

The amount of income (loss) from continuing operations before extraordinary items reported by an equity method investment of the entity.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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

-Publisher SEC

-Name Regulation S-X (SX)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33908-111571

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- Definition

The amount of net income (loss) reported by an equity method investment of the entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

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-Publisher FASB

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

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- Definition

The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

+ References

No definition available.

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