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Note 1 - Significant Accounting Policies and Concentration of Risk - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Amortized Cost	$ 41,407	$ 70,261
Accrued Interest	77	292
Gross Unrealized Gains	11	6
Gross Unrealized Losses	(23)	(212)
Estimated Fair Value	41,472	70,347
US Government Agencies Debt Securities [Member]
Amortized Cost	20,266	26,557
Accrued Interest	34	88
Gross Unrealized Gains	2
Gross Unrealized Losses	(4)	(99)
Estimated Fair Value	20,298	26,546
Corporate Debt Securities [Member]
Amortized Cost	6,179	21,820
Accrued Interest	26	184
Gross Unrealized Gains	2
Gross Unrealized Losses	(8)	(41)
Estimated Fair Value	6,199	21,963
Certificates of Deposit [Member]
Amortized Cost	14,962	21,884
Accrued Interest	17	20
Gross Unrealized Gains	7	6
Gross Unrealized Losses	(11)	(72)
Estimated Fair Value	$ 14,975	$ 21,838

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

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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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