Note 1 - Summary of Significant Accounting Policies (Details) - Financial Assets, Measured at Fair Value (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Note 1 - Summary of Significant Accounting Policies (Details) - Financial Assets, Measured at Fair Value [Line Items]
Cost	$ 3,572	$ 5,124
Unrealized Gain	7	(3)
Fair Value	3,579us-gaap_AvailableForSaleSecurities	5,121us-gaap_AvailableForSaleSecurities
Asset-backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Note 1 - Summary of Significant Accounting Policies (Details) - Financial Assets, Measured at Fair Value [Line Items]
Cost	96	460
Unrealized Gain	7	(4)
Fair Value	103	456
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Note 1 - Summary of Significant Accounting Policies (Details) - Financial Assets, Measured at Fair Value [Line Items]
Cost	76	164
Unrealized Gain		1
Fair Value	76	165
US Treasury Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Note 1 - Summary of Significant Accounting Policies (Details) - Financial Assets, Measured at Fair Value [Line Items]
Cost	3,400	4,500
Unrealized Gain	0	0
Fair Value	$ 3,400	$ 4,500

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.2)

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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

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

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-Name Accounting Standards Codification

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