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Note 2 - Marketable Securities - Maturities of Available-for-sale Securities (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Due within one year, amortized cost | $ 955
Due within one year, estimated fair value | 951
Due after one year through five years, amortized cost | 3,805
Due after one year through five years, estimated fair value | 3,764
Total available-for-sale securities, amortized cost | 4,760
Total available-for-sale securities, estimated fair value | $ 4,715

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