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Note 4 - Marketable Securities - Maturities of Available-for-sale Securities (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Due within one year, amortized cost	$ 2,862
Due within one year, estimated fair value	2,852
Due after one year through five years, amortized cost	6,332
Due after one year through five years, estimated fair value	6,239
Due after five years through ten years, amortized cost	154
Due after five years through ten years, estimated fair value	152
Total available-for-sale securities, amortized cost	9,348
Total available-for-sale securities, estimated fair value	$ 9,243

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