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Note 1 - Significant Accounting Policies - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost | $ 61,778 | $ 99,965
Accrued Interest | 309 | 444
Gross Unrealized Gains | 82 | 19
Gross Unrealized Losses | (41) | (316)
Estimated Fair Value | 62,128 | 100,112
US Government Agencies Debt Securities [Member] |  |
Amortized Cost | 32,488 | 50,613
Accrued Interest | 144 | 176
Gross Unrealized Gains | 50 | 15
Gross Unrealized Losses | (13) | (131)
Estimated Fair Value | 32,669 | 50,673
Corporate Debt Securities [Member] |  |
Amortized Cost | 25,731 | 45,793
Accrued Interest | 147 | 254
Gross Unrealized Gains | 24 | 4
Gross Unrealized Losses | (27) | (171)
Estimated Fair Value | 25,875 | 45,880
Certificates of Deposit [Member] |  |
Amortized Cost | 3,559 | 3,559
Accrued Interest | 18 | 14
Gross Unrealized Gains | 8 |
Gross Unrealized Losses | (1) | (14)
Estimated Fair Value | $ 3,584 | $ 3,559

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