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STOCK-BASED COMPENSATION AND STOCK REPURCHASE PROGRAM (Narrative) (Details) - USD ($)
 6 Months Ended 161 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 5 years      
Expiration period 10 years      
Treasury stock, shares 112,996   112,996 112,996
Cost of shares repurchased by ESOP trust $ 2,300,000      
Average cost of shares repurchased (per share) $ 10.58      
Description of loan with respect to employee stock ownership plan In 2006 the ESOP trust purchased 217,863 shares of common stock in the open market using proceeds of a loan from the Company. The total cost of shares purchased by the ESOP trust was $2.3 million, reflecting an average cost per share of $10.58. The Bank makes cash contributions to the ESOP on an annual basis sufficient to enable the ESOP to make the required loan payments to the Company. The loan bears a variable interest rate that adjusts annually every January 1st to the then published Prime Rate (3.25% at January 1, 2021) with principal and interest payable annually in equal installments over thirty years. The loan is secured by shares of the Company’s stock.      
Interest rate of loan with respect to employee stock ownership plan 3.25%   3.25%  
Shares allocated 217,863   217,863  
ESOP compensation expense $ 50,000 $ 73,000    
Total ESOP shares 217,863   217,863  
Second Repurchase Program [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum stock repurchase authorization (as a percent)     5.00%  
Stock authorized to be repurchased (in shares) 129,924   129,924  
Stock repurchased during period (in shares)     91,000  
Remaining shares available to be repurchased 38,924   38,924  
Common stock average cost (in dollars per share)     $ 8.41