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Note 1 - Significant Accounting Policies - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
US Government Agencies Debt Securities [Member]
Amortized Cost	$ 6,186	$ 26,557
Accrued Interest	15	88
Gross Unrealized Gains	3
Gross Unrealized Losses		(99)
Estimated Fair Value	6,204	26,546
Corporate Debt Securities [Member]
Amortized Cost	7,187	21,820
Accrued Interest	24	184
Gross Unrealized Gains	5
Gross Unrealized Losses	(1)	(41)
Estimated Fair Value	7,215	21,963
Certificates of Deposit [Member]
Amortized Cost	18,342	21,884
Accrued Interest	29	21
Gross Unrealized Gains	19	5
Gross Unrealized Losses	(4)	(72)
Estimated Fair Value	18,386	21,838
Amortized Cost	31,715	70,261
Accrued Interest	68	293
Gross Unrealized Gains	27	5
Gross Unrealized Losses	(5)	(212)
Estimated Fair Value	$ 31,805	$ 70,347

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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-Publisher FASB
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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