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Note 1 - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
US Government Agencies Debt Securities [Member]
Amortized Cost	$ 23,119	$ 20,307
Accrued Interest	42	$ 22
Gross Unrealized Gains	28
Gross Unrealized Losses	(2)	$ (23)
Estimated Fair Value	23,187	20,306
Corporate Debt Securities [Member]
Amortized Cost	27,249	27,152
Accrued Interest	141	151
Gross Unrealized Gains	26	5
Gross Unrealized Losses	(14)	(47)
Estimated Fair Value	27,402	27,261
Certificates of Deposit [Member]
Amortized Cost	20,909	11,838
Accrued Interest	28	$ 6
Gross Unrealized Gains	10
Gross Unrealized Losses	(49)	$ (63)
Estimated Fair Value	20,898	11,781
Amortized Cost	71,277	59,297
Accrued Interest	211	179
Gross Unrealized Gains	64	5
Gross Unrealized Losses	(65)	(133)
Estimated Fair Value	$ 71,487	$ 59,348

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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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