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Note 4 - Marketable Securities - Maturities of Available-for-sale Securities (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Due within one year, amortized cost	$ 1,639
Due within one year, estimated fair value	1,640
Due after one year through five years, amortized cost	2,212
Due after one year through five years, estimated fair value	2,243
Due after five years, amortized cost
Due after five years, estimated fair value
Total available-for-sale securities, amortized cost	3,851
Total available-for-sale securities, estimated fair value	$ 3,883

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