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Note 1 - Significant Accounting Policies and Concentration of Risk - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Amortized Cost | $ 41,407 | $ 70,261
Accrued Interest | 77 | 292
Gross Unrealized Gains | 11 | 6
Gross Unrealized Losses | (23) | (212)
Estimated Fair Value | 41,472 | 70,347
US Government Agencies Debt Securities [Member] |  |
Amortized Cost | 20,266 | 26,557
Accrued Interest | 34 | 88
Gross Unrealized Gains | 2 |
Gross Unrealized Losses | (4) | (99)
Estimated Fair Value | 20,298 | 26,546
Corporate Debt Securities [Member] |  |
Amortized Cost | 6,179 | 21,820
Accrued Interest | 26 | 184
Gross Unrealized Gains | 2 |
Gross Unrealized Losses | (8) | (41)
Estimated Fair Value | 6,199 | 21,963
Certificates of Deposit [Member] |  |
Amortized Cost | 14,962 | 21,884
Accrued Interest | 17 | 20
Gross Unrealized Gains | 7 | 6
Gross Unrealized Losses | (11) | (72)
Estimated Fair Value | $ 14,975 | $ 21,838

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