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Note 1 - Significant Accounting Policies - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized Cost | $ 50,446 | $ 41,407
Accrued Interest | 149 | 77
Gross Unrealized Gains | 10 | 11
Gross Unrealized Losses | (25) | (23)
Estimated Fair Value | 50,580 | 41,472
US Government Agencies Debt Securities [Member] |  |
Amortized Cost | 26,436 | 20,266
Accrued Interest | 85 | 34
Gross Unrealized Gains |  | 2
Gross Unrealized Losses | (11) | (4)
Estimated Fair Value | 26,510 | 20,298
Corporate Debt Securities [Member] |  |
Amortized Cost | 9,248 | 6,179
Accrued Interest | 42 | 26
Gross Unrealized Gains | 1 | 2
Gross Unrealized Losses | (8) | (8)
Estimated Fair Value | 9,283 | 6,199
Certificates of Deposit [Member] |  |
Amortized Cost | 14,762 | 14,962
Accrued Interest | 22 | 17
Gross Unrealized Gains | 9 | 7
Gross Unrealized Losses | (6) | (11)
Estimated Fair Value | $ 14,787 | $ 14,975

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