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STOCK-BASED COMPENSATION AND STOCK REPURCHASE PROGRAM (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended | 167 Months Ended |
--- | --- | --- | --- | ---
Jul. 14, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Oct. 08, 2021
Stock option expenses |  | $ 0 | $ 0 |  |
Stock award expenses |  | 0 | 0 |  |
Cost of shares repurchased by ESOP trust | $ 3,200 | $ 2,300 |  |  |
Average cost of shares repurchased (per share) | $ 10.75 | $ 10.58 |  |  |
Description of loan with respect to employee stock ownership plan |  | The Company’s ESOP (“2006 ESOP”) was established in 2006 as part of the Company’s initial public offering. The total cost of shares purchased by the 2006 ESOP trust was $2.3 million, reflecting an average cost per share of $10.58. The loan bore a variable interest rate that adjusted annually to Prime Rate (3.25% at January 1, 2021) with principal and interest payable annually in equal installments over thirty years. The 2006 ESOP loan was fully repaid during the year ended September 30, 2021. |  |  |
Interest rate of loan with respect to employee stock ownership plan |  | 3.25% |  | 3.25% |
Fair value of unreleased shares |  | $ 3,500 |  | $ 3,500 |
ESOP compensation expense |  | $ 107 | $ 126 |  |
Total ESOP shares | 304,377 | 522,240 |  | 522,240 |
Number of ESOP shares intended to by purchased by Trustees in connection with the second-step conversion offerring |  | 312,800 |  | 312,800 |
Percentage of common shares sold |  | 8.00% |  |  |
Subsequent Event [Member] |  |  |  |  |
Remaining shares available to be repurchased |  |  |  |  | 8,423
Interest rate of loan with respect to employee stock ownership plan |  |  |  |  | 3.25%
First Repurchase Program [Member] |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  | 130,927 |
Second Repurchase Program [Member] |  |  |  |  |
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) |  |  | 10,000 | 91,000 |
Common stock average cost (in dollars per share) |  |  | $ 9.03 | $ 8.41 |

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