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Note 1 - Significant Accounting Policies - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized Cost | $ 27,258 | $ 41,407
Accrued Interest | 72 | 77
Gross Unrealized Gains | 11 | 11
Gross Unrealized Losses | (14) | (23)
Estimated Fair Value | 27,327 | 41,472
US Government Agencies Debt Securities [Member] |  |
Amortized Cost | 7,312 | 20,266
Accrued Interest | 27 | 34
Gross Unrealized Gains |  | 2
Gross Unrealized Losses | (5) | (4)
Estimated Fair Value | 7,334 | 20,298
Corporate Debt Securities [Member] |  |
Amortized Cost | 6,171 | 6,179
Accrued Interest | 21 | 26
Gross Unrealized Gains |  | 2
Gross Unrealized Losses | (4) | (8)
Estimated Fair Value | 6,188 | 6,199
Certificates of Deposit [Member] |  |
Amortized Cost | 13,775 | 14,962
Accrued Interest | 24 | 17
Gross Unrealized Gains | 11 | 7
Gross Unrealized Losses | (5) | (11)
Estimated Fair Value | $ 13,805 | $ 14,975

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