Note 6 - Mortgage-backed Securities - Schedule of Information Relating to Private Label CMO Portfolio (Details) - USD ($) $ in Thousands		Dec. 31, 2021		Jun. 30, 2021
Investment securities held-to-maturity (fair value of $9,978 and $15,592)		$ 9,953		$ 15,489
Investment securities held-to-maturity, fair value		9,978		15,592
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Investment securities held-to-maturity (fair value of $9,978 and $15,592)		334		400
Investment securities held-to-maturity, fair value		408	[1]	$ 457
Life to date impairment recorded in earnings		500
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Cusip No. 126694CP1 [Member]
Investment securities held-to-maturity (fair value of $9,978 and $15,592)		211
Investment securities held-to-maturity, fair value	[1]	247
Life to date impairment recorded in earnings		271
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Cusip No. 126694KF4 [Member]
Investment securities held-to-maturity (fair value of $9,978 and $15,592)		91
Investment securities held-to-maturity, fair value	[1]	121
Life to date impairment recorded in earnings		181
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Cusip No. 126694MP0 [Member]
Investment securities held-to-maturity (fair value of $9,978 and $15,592)		32
Investment securities held-to-maturity, fair value	[1]	40
Life to date impairment recorded in earnings		$ 48

[1] Fair value estimate provided by the Company's independent third-party valuation consultant.