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Note 4 - Marketable Securities - Maturities of Available-for-sale Securities (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Due within one year, amortized cost	$ 3,145
Due within one year, estimated fair value	3,132
Due after one year through five years, amortized cost	7,508
Due after one year through five years, estimated fair value	7,416
Total available-for-sale securities, amortized cost	10,653
Total available-for-sale securities, estimated fair value	$ 10,548

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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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