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Note 1 - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
US Government Agencies Debt Securities [Member]
Amortized Cost	$ 14,081	$ 26,557
Accrued Interest	38	88
Gross Unrealized Gains	8
Gross Unrealized Losses		(99)
Estimated Fair Value	14,127	26,546
Corporate Debt Securities [Member]
Amortized Cost	16,641	21,820
Accrued Interest	147	184
Gross Unrealized Gains	23
Gross Unrealized Losses	(1)	(41)
Estimated Fair Value	16,810	21,963
Certificates of Deposit [Member]
Amortized Cost	20,258	21,884
Accrued Interest	22	21
Gross Unrealized Gains	23	5
Gross Unrealized Losses	(7)	(72)
Estimated Fair Value	20,296	21,838
Amortized Cost	50,980	70,261
Accrued Interest	207	293
Gross Unrealized Gains	54	5
Gross Unrealized Losses	(8)	(212)
Estimated Fair Value	$ 51,233	$ 70,347

X

- Definition

Represents available for sale securities accrued interest.

+ References

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X

- Definition

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
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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- Definition

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+ References

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)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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