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Note 1 - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
US Government Agencies Debt Securities [Member]
Amortized Cost	$ 9,649	$ 20,307
Accrued Interest	16	$ 22
Gross Unrealized Gains	2
Gross Unrealized Losses	(6)	$ (23)
Estimated Fair Value	9,661	20,306
Corporate Debt Securities [Member]
Amortized Cost	28,830	27,152
Accrued Interest	197	151
Gross Unrealized Gains	14	5
Gross Unrealized Losses	(34)	(47)
Estimated Fair Value	29,007	27,261
Certificates of Deposit [Member]
Amortized Cost	15,030	11,838
Accrued Interest	13	$ 6
Gross Unrealized Gains	3
Gross Unrealized Losses	(71)	$ (63)
Estimated Fair Value	14,975	11,781
Amortized Cost	53,509	59,297
Accrued Interest	226	179
Gross Unrealized Gains	19	5
Gross Unrealized Losses	(111)	(133)
Estimated Fair Value	$ 53,643	$ 59,348

X

- Definition

Represents available for sale securities accrued interest.

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- Definition

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

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-SubTopic 10



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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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