Note 6 - Mortgage-backed Securities (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2021
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total	$ 9,953		$ 9,953		$ 15,489
Payments to Acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity			50,752	$ (0)
Other than Temporary Impairment Losses, Investments, Total	0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total	112,463		112,463		82,059
Increase (Decrease) in Held to Maturity Securities			50,800
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total	334		334		400
Increase (Decrease) in Held to Maturity Securities			30,300
Payments to Acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity			20,400
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS)	42		71
Other than Temporary Impairment Losses, Investments, Total	0	$ 0	0	$ 0
Collateralized Mortgage Backed Securities [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total	112,797		112,797		82,459
Mortgage Backed Securities Pledged as Collateral	112,500		112,500		78,900
Held to Maturity Securities Pledged as Collateral, Fair Value	112,600		112,600		79,000
Held to Maturity Securities Pledged as Collateral, Excess Collateral	$ 20,000		$ 20,000		$ 5,000