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Note 7 - Investment and Equity Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Due in one year or less, amortized costs	$ 6,479
Due in one year or less, fair value	6,519
Due after one year through five years, amortized costs	1,665
Due after one year through five years, fair value	1,683
Due after five years through ten years, amortized costs	13,024
Due after five years through ten years, fair value	13,074
Due after ten years, amortized costs	76,134
Due after ten years, fair value	76,838
Amortized costs	97,302
Fair Value	$ 98,114

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