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Note 7 - Investment and Equity Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Due in one year or less, amortized costs	$ 5,676
Due in one year or less, fair value	5,729
Due after one year through five years, amortized costs	6,202
Due after one year through five years, fair value	6,267
Due after five years through ten years, amortized costs	12,267
Due after five years through ten years, fair value	12,156
Due after ten years, amortized costs	76,426
Due after ten years, fair value	75,876
Amortized costs	100,571
Fair Value	$ 100,028

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