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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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