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Note 6 - Mortgage-backed Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2022
Mar. 31, 2022
Mar. 31, 2021
Jun. 30, 2021
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total $ 9,954 $ 9,954   $ 15,489
Payments to Acquire Mortgage-Backed Securities (MBS) categorized as Held-to-Maturity   79,236 $ 13,163  
Proceeds from Sale and Maturity of Held-to-Maturity Securities, Total   5,540 $ 750  
Other than Temporary Impairment Losses, Investments, Total 0 0    
Debt Securities, Held-to-Maturity, Fair Value, Total 9,545 9,545   15,592
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]        
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total 129,054 129,054   82,059
Increase (Decrease) in Held to Maturity Securities 47,000      
Payments to Acquire Mortgage-Backed Securities (MBS) categorized as Held-to-Maturity 79,200      
Debt Securities, Held-to-Maturity, Fair Value, Total 125,502 125,502   82,202
Mortgage-Backed Securities, Issued by Private Enterprises [Member]        
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total 359 359   400
Proceeds from Sale and Maturity of Held-to-Maturity Securities, Total 32,300      
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS) 25 96    
Other than Temporary Impairment Losses, Investments, Total 0 0    
Debt Securities, Held-to-Maturity, Fair Value, Total 422 [1] 422 [1]   457
Collateralized Mortgage-Backed Securities [Member]        
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total 129,413 129,413   82,459
Debt Securities, Held-to-Maturity, Fair Value, Total 125,924 125,924   82,659
Held to Maturity Securities Pledged as Collateral, Excess Collateral 13,100 13,100   5,000
Collateralized Mortgage-Backed Securities [Member] | Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member]        
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total 129,100 129,100    
Debt Securities, Held-to-Maturity, Fair Value, Total $ 125,500 $ 125,500   79,000
Collateralized Mortgage-Backed Securities [Member] | Asset Pledged as Collateral [Member] | Deposits and Federal Home Loan Bank Advances [Member]        
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total       $ 78,900
[1] Fair value estimate provided by the Company's independent third-party valuation consultant.