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Note 3 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Securities available for sale, due within one year, amortized cost	$ 0
Securities available for sale, due within one year, fair value		$ 0
Securities available for sale, due after one year but within five years, amortized cost	31,290
Securities available for sale, due after one year but within five years, fair value		31,609
Securities available for sale, due after five years but within ten years, amortized cost	31,029
Securities available for sale, due after five years but within ten years, fair value		31,475
Securities available for sale, due after ten years, amortized cost	0
Securities available for sale, due after ten years, fair value		0
Securities available for sale, single maturity date, amortized cost	62,319
Securities available for sale, single maturity date, fair value		63,084
Total debt securities available for sale, amortized cost	96,514
Total debt securities available for sale, fair value		98,367
Collateralized Mortgage Backed Securities [Member]
Securities available for sale, no single maturity date, amortized cost	$ 34,195
Securities available for sale, no single maturity date, fair value		$ 35,283

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- Definition

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 sixth through tenth 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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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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Fair value 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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), without single maturity date and not allocated over maturity grouping.

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