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Note 1 - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
US Government Agencies Debt Securities [Member] |  |
Amortized Cost | $ 14,081 | $ 26,557
Accrued Interest | 38 | 88
Gross Unrealized Gains | 8 |
Gross Unrealized Losses |  | (99)
Estimated Fair Value | 14,127 | 26,546
Corporate Debt Securities [Member] |  |
Amortized Cost | 16,641 | 21,820
Accrued Interest | 147 | 184
Gross Unrealized Gains | 23 |
Gross Unrealized Losses | (1) | (41)
Estimated Fair Value | 16,810 | 21,963
Certificates of Deposit [Member] |  |
Amortized Cost | 20,258 | 21,884
Accrued Interest | 22 | 21
Gross Unrealized Gains | 23 | 5
Gross Unrealized Losses | (7) | (72)
Estimated Fair Value | 20,296 | 21,838
Amortized Cost | 50,980 | 70,261
Accrued Interest | 207 | 293
Gross Unrealized Gains | 54 | 5
Gross Unrealized Losses | (8) | (212)
Estimated Fair Value | $ 51,233 | $ 70,347

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