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Note 3 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale - matures within one year, Amortized cost | $ 18,224 | $ 6,094
Available-for-sale - matures within one year, Gross unrealized gains | 16 |
Available-for-sale - matures within one year, Gross unrealized losses | (11) | (32)
Available-for-sale - matures within one year, Fair value | 18,229 | 6,062
Available-for-sale - matures after one year through five years, Amortized cost | 46,593 | 72,598
Available-for-sale - matures after one year through five years, Gross unrealized gains | 168 | 134
Available-for-sale - matures after one year through five years, Gross unrealized losses | (123) | (1,325)
Available-for-sale - matures after one year through five years, Fair value | 46,638 | 71,407
Available-for-sale, Amortized cost | 64,817 | 78,692
Available-for-sale, Gross unrealized gains | 184 | 134
Available-for-sale, Gross unrealized losses | (134) | (1,357)
Marketable securities (Note 3) | 64,867 | 77,469
Certificates of Deposits [Member] |  |
Available-for-sale - matures after one year through five years, Amortized cost |  | 747
Available-for-sale - matures after one year through five years, Gross unrealized gains |  |
Available-for-sale - matures after one year through five years, Gross unrealized losses |  |
Available-for-sale - matures after one year through five years, Fair value |  | 747
Marketable securities (Note 3) |  | 747
Corporate Bonds [Member] |  |
Available-for-sale - matures within one year, Amortized cost | 18,224 | 6,094
Available-for-sale - matures within one year, Gross unrealized gains | 16 |
Available-for-sale - matures within one year, Gross unrealized losses | (11) | (32)
Available-for-sale - matures within one year, Fair value | 18,229 | 6,062
Available-for-sale - matures after one year through five years, Amortized cost | 46,593 | 71,350
Available-for-sale - matures after one year through five years, Gross unrealized gains | 168 | 134
Available-for-sale - matures after one year through five years, Gross unrealized losses | (123) | (1,320)
Available-for-sale - matures after one year through five years, Fair value | $ 46,638 | 70,164
Government Bonds [Member] |  |
Available-for-sale - matures after one year through five years, Amortized cost |  | 501
Available-for-sale - matures after one year through five years, Gross unrealized gains |  |
Available-for-sale - matures after one year through five years, Gross unrealized losses |  | (5)
Available-for-sale - matures after one year through five years, Fair value |  | $ 496

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