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Note 9 - Senior Debt (Details Textual) - USD ($)
12 Months Ended 48 Months Ended
Dec. 31, 2018
Jun. 30, 2022
Jun. 30, 2017
Escrow Deposit $ 417,000    
Senior Notes [Member]      
Debt Instrument, Face Amount     $ 10,000,000
Debt Instrument, Periodic Payment, Principal 250,000    
Borrowing Proceeds Contributed to Bank as Common Equity Tier 1 Capital 9,000,000    
Borrowing Proceeds Retained by Lender in Escrow $ 1,000,000    
Senior Notes [Member] | Subsidiaries [Member]      
Debt Instrument, Financial Covenants, Non-performing Assets to Total Assets, Percentage, Minimum 2.50%    
Senior Notes [Member] | Scenario, Forecast [Member]      
Debt Instrument, Financial Convenants, Minimum Cash on Hand   $ 2,500,000  
Debt Instrument, Financial Convenants, Minimum Risk Based Capital to Risk Weighted Assets   10.00%  
Senior Notes [Member] | Scenario, Forecast [Member] | Subsidiaries [Member]      
Debt Instrument, Financial Convenants, Minimum Risk Based Capital to Risk Weighted Assets   11.00%  
Senior Notes [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 2.50%