Note 5 - Investment Securities - Schedule of Amortized Cost and Fair Values of Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2021		Jun. 30, 2021
Investment securities available-for-sale, amortized cost	$ 137,703		$ 150,886
Gross Unrealized Gains	312		725
Gross Unrealized Losses	(261)		(34)
Investment securities available-for-sale (amortized cost of $137,703 and $150,886)	137,754		151,577
Investment securities - held to maturity	9,953		15,489
Gross Unrealized Gains	75		103
Gross Unrealized Losses	(50)		0
Fair Value	9,978		15,592
US Government Corporations and Agencies Securities [Member]
Investment securities available-for-sale, amortized cost	3,204		3,215
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(22)		(1)
Investment securities available-for-sale (amortized cost of $137,703 and $150,886)	3,182		3,214
Investment securities - held to maturity	7,748		12,744
Gross Unrealized Gains	0		5
Gross Unrealized Losses	(50)		0
Fair Value	7,698		12,749
Corporate Debt Securities [Member]
Investment securities available-for-sale, amortized cost	96,710		109,501
Gross Unrealized Gains	220		546
Gross Unrealized Losses	(154)		(7)
Investment securities available-for-sale (amortized cost of $137,703 and $150,886)	96,776		110,040
US States and Political Subdivisions Debt Securities [Member]
Investment securities available-for-sale, amortized cost	724		730
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(13)		(5)
Investment securities available-for-sale (amortized cost of $137,703 and $150,886)	711		725
Investment securities - held to maturity	2,205		2,745
Gross Unrealized Gains	75		98
Gross Unrealized Losses	0		0
Fair Value	2,280		2,843
Debt Security, Corporate, Non-US [Member]
Investment securities available-for-sale, amortized cost	37,065	[1]	37,440
Gross Unrealized Gains	92	[1]	179
Gross Unrealized Losses	(72)	[1]	(21)
Investment securities available-for-sale (amortized cost of $137,703 and $150,886)	$ 37,085	[1]	$ 37,598

[1] U.S. dollar denominated investment-grade corporate bonds of large foreign corporate issuers.