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Note 1 - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
US Government Agencies Debt Securities [Member] |  |
Amortized Cost | $ 26,557 | $ 20,307
Accrued Interest | $ 88 | $ 22
Gross Unrealized Gains |  |
Gross Unrealized Losses | $ (99) | $ (23)
Estimated Fair Value | 26,546 | 20,306
Corporate Debt Securities [Member] |  |
Amortized Cost | 21,820 | 27,152
Accrued Interest | $ 184 | 151
Gross Unrealized Gains |  | 5
Gross Unrealized Losses | $ (41) | (47)
Estimated Fair Value | 21,963 | 27,261
Certificates of Deposit [Member] |  |
Amortized Cost | 21,884 |
Accrued Interest | 21 |
Gross Unrealized Gains | 5 |
Gross Unrealized Losses | (72) |
Estimated Fair Value | 21,838 |
Commercial Paper [Member] |  |
Amortized Cost |  | 11,838
Accrued Interest |  | $ 6
Gross Unrealized Gains |  |
Gross Unrealized Losses |  | $ (63)
Estimated Fair Value |  | 11,781
Amortized Cost | 70,261 | 59,297
Accrued Interest | 293 | 179
Gross Unrealized Gains | 5 | 5
Gross Unrealized Losses | (212) | (133)
Estimated Fair Value | $ 70,347 | $ 59,348

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