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Note 3 - Debt Securities - Securities by Contractual Maturity (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Securities available for sale, due within one year, amortized cost
Securities available for sale, due within one year, fair value
Securities available for sale, due after one year but within five years, amortized cost	31,140
Securities available for sale, due after one year but within five years, fair value	31,414
Securities available for sale, due after five years but within ten years, amortized cost	38,054
Securities available for sale, due after five years but within ten years, fair value	38,482
Securities available for sale, due after ten years, amortized cost
Securities available for sale, due after ten years, fair value
Securities available for sale, single maturity date, amortized cost	69,194
Securities available for sale, single maturity date, fair value	69,896
Total debt securities available for sale, amortized cost	105,842
Total debt securities available for sale, fair value	107,753
Collateralized Mortgage Backed Securities [Member]
Securities available for sale, no single maturity date, amortized cost	36,648
Securities available for sale, no single maturity date, fair value	$ 37,857

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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