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Note 1 - Significant Accounting Policies and Concentrations of Risk - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Amortized Cost	$ 105,241	$ 41,407
Accrued Interest	412	77
Gross Unrealized Gains	1	11
Gross Unrealized Losses	(244)	(23)
Estimated Fair Value	105,410	41,472
US Government Agencies Debt Securities [Member]
Amortized Cost	60,121	20,266
Accrued Interest	177	34
Gross Unrealized Gains		2
Gross Unrealized Losses	(122)	(4)
Estimated Fair Value	60,176	20,298
Corporate Debt Securities [Member]
Amortized Cost	34,021	6,179
Accrued Interest	203	26
Gross Unrealized Gains		2
Gross Unrealized Losses	(108)	(8)
Estimated Fair Value	34,116	6,199
Certificates of Deposit [Member]
Amortized Cost	11,099	14,962
Accrued Interest	32	17
Gross Unrealized Gains	1	7
Gross Unrealized Losses	(14)	(11)
Estimated Fair Value	$ 11,118	$ 14,975

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

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