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Note 1 - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
US Government Agencies Debt Securities [Member] |  |
Amortized Cost | $ 21,666 | $ 26,557
Accrued Interest | 53 | $ 88
Gross Unrealized Gains | 15 |
Gross Unrealized Losses | (6) | $ (99)
Estimated Fair Value | 21,728 | 26,546
Corporate Debt Securities [Member] |  |
Amortized Cost | 20,718 | 21,820
Accrued Interest | 94 | $ 184
Gross Unrealized Gains | 23 |
Gross Unrealized Losses | (3) | $ (41)
Estimated Fair Value | 20,832 | 21,963
Certificates of Deposit [Member] |  |
Amortized Cost | 21,438 | 21,884
Accrued Interest | 32 | 21
Gross Unrealized Gains | 26 | 5
Gross Unrealized Losses | (8) | (72)
Estimated Fair Value | 21,488 | 21,838
Amortized Cost | 63,822 | 70,261
Accrued Interest | 179 | 293
Gross Unrealized Gains | 64 | 5
Gross Unrealized Losses | (17) | (212)
Estimated Fair Value | $ 64,048 | $ 70,347

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