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Note 2 - Marketable Securities - Maturities of Available-for-sale Securities (Details) $ in Thousands	Dec. 31, 2018 USD ($)
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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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