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Note 4 - Marketable Securities - Maturities of Available-for-sale Securities (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Due within one year, amortized cost	$ 1,982
Due within one year, estimated fair value	1,972
Due after one year through five years, amortized cost	5,848
Due after one year through five years, estimated fair value	5,757
Due after five years through ten years, amortized cost
Due after five years through ten years, estimated fair value
Total available-for-sale securities, amortized cost	7,830
Total available-for-sale securities, estimated fair value	$ 7,729

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