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Note 6 - Marketable Securities - Short-term and Long-term Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost | $ 33,425 | $ 70,329
Unrealized Gains | 134 | 1
Unrealized Losses | (16) | (242)
Fair Value | 33,543 | 70,088
Bank Time Deposits [Member] |  |
Amortized Cost | 1,479 | 4,208
Unrealized Gains | 22 | 0
Unrealized Losses | (1) | (25)
Fair Value | 1,500 | 4,183
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized Cost | 5,612 | 17,509
Unrealized Gains | 11 | 1
Unrealized Losses | (3) | (33)
Fair Value | 5,620 | 17,477
Corporate Debt Securities [Member] |  |
Amortized Cost | 16,503 | 31,769
Unrealized Gains | 100 | 0
Unrealized Losses | (1) | (96)
Fair Value | 16,602 | 31,673
US Government Agencies Debt Securities [Member] |  |
Amortized Cost | 8,340 | 16,843
Unrealized Gains | 1 | 0
Unrealized Losses | (10) | (88)
Fair Value | 8,331 | $ 16,755
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Amortized Cost | 1,491 |
Unrealized Gains | 0 |
Unrealized Losses | (1) |
Fair Value | $ 1,490 |

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