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RETIREMENT PLANS (Tables)
 12 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Schedule of changes in benefit obligations, fair values of plan assets and reconciliations of the funded status of the retirement plans
The following tables detail the changes in benefit obligations, fair values of plan assets and reconciliations of the funded status of the retirement plans:
 PensionSERPPost-retirement Medical
 September 30,
 202120202021202020212020
Change in Projected Benefit Obligation:     
Benefit obligation at beginning of year$10,280,000 $10,971,000 $2,031,000 $2,385,000 $2,839,000 $2,633,000 
Service cost— 50,000 — 3,000 — — 
Interest cost258,000 304,000 51,000 63,000 48,000 80,000 
Actuarial (gain) loss(15,000)504,000 63,000 (90,000)— 134,000 
Benefits paid(158,000)(153,000)(9,000)— (5,000)(8,000)
Curtailments— (1,396,000)— (330,000)— — 
Termination of post-retirement medical plan— — — — (2,882,000)— 
Benefit obligation at end of year10,365,000 10,280,000 2,136,000 2,031,000 — 2,839,000 
Change in Plan Assets:      
Fair value of plan assets at beginning of year11,051,000 10,192,000 — — — — 
Actual return on plan assets1,701,000 1,012,000 — — — — 
Employer contributions— — — — 5,000 8,000 
Benefits paid(158,000)(153,000)— — (5,000)(8,000)
Fair value of plan assets at end of year12,594,000 11,051,000 — — — — 
Funded status$2,229,000 $771,000 $(2,136,000)$(2,031,000)$— $(2,839,000)
Schedule of amounts recognized in the consolidated balance sheets
 PensionSERPPost-retirement Medical
 September 30,
 202120202021202020212020
Amounts recognized in the Consolidated Balance Sheets: 
Noncurrent assets$2,229,000 $771,000 $— $— $— $— 
Current liabilities— — (35,000)(32,000)— (9,000)
Noncurrent liabilities— — (2,101,000)(1,999,000)— (2,830,000)
Net amount$2,229,000 $771,000 $(2,136,000)$(2,031,000)$— $(2,839,000)
Amounts recognized in accumulated other comprehensive income (loss) before income taxes: 
Net actuarial loss$471,000 $1,681,000 $135,000 $72,000 $— $721,000 
Prior service cost (credit)— — — — — — 
Accumulated other comprehensive loss$471,000 $1,681,000 $135,000 $72,000 $— $721,000 
Schedule of amounts recognized in accumulated other comprehensive (loss) income
 PensionSERPPost-retirement Medical
 September 30,
 202120202021202020212020
Amounts recognized in the Consolidated Balance Sheets: 
Noncurrent assets$2,229,000 $771,000 $— $— $— $— 
Current liabilities— — (35,000)(32,000)— (9,000)
Noncurrent liabilities— — (2,101,000)(1,999,000)— (2,830,000)
Net amount$2,229,000 $771,000 $(2,136,000)$(2,031,000)$— $(2,839,000)
Amounts recognized in accumulated other comprehensive income (loss) before income taxes: 
Net actuarial loss$471,000 $1,681,000 $135,000 $72,000 $— $721,000 
Prior service cost (credit)— — — — — — 
Accumulated other comprehensive loss$471,000 $1,681,000 $135,000 $72,000 $— $721,000 
Schedule of weighted-average assumptions used to determine benefit obligations and net periodic benefit (income) costs
The following table presents the weighted-average assumptions used to determine benefit obligations and net benefit (income) costs:
 PensionSERPPost-retirement Medical
                   Year ended September 30,
 202120202021202020212020
Assumptions used to determine fiscal year-end benefit obligations:  
Discount rate2.84%2.54%2.84%2.54%N/A2.54%
Rate of compensation increaseN/AN/AN/AN/AN/AN/A
Assumptions used to determine net benefit costs (years ended):   
Discount rate2.54%
3.06% / 3.15%(1)
2.54%
3.06% / 3.15%(1)
2.54% / 3.00%(2)
3.06%
Expected return on plan assets5.00%6.50%N/AN/AN/AN/A
Rate of compensation increaseN/A4.00%N/A4.00%N/AN/A
_______________________________________________
(1)       3.06% as of September 30, 2019 and 3.15% as of December 31, 2019 remeasurement.
(2)       2.54% as of September 30, 2020 and 3.00% as of May 31, 2021 termination.
Schedule of components of net periodic benefit (income) cost
The components of net periodic benefit (income) cost are as follows:
 PensionSERPPost-retirement Medical
 Year ended September 30,
 202120202021202020212020
Net periodic benefit (income) cost for the year: 
Service cost$— $50,000 $— $3,000 $— $— 
Interest cost258,000 304,000 51,000 63,000 48,000 80,000 
Expected return on plan assets(546,000)(680,000)— — — — 
Amortization of prior service cost (credit)— 1,000 — (1,000)— — 
Amortization of net actuarial loss 39,000 35,000 — 5,000 62,000 80,000 
Curtailment cost (income)— 53,000 — (53,000)— — 
Net periodic benefit (income) cost$(249,000)$(237,000)$51,000 $17,000 $110,000 $160,000 
Schedule of benefits expected to be paid under the retirement plans
The benefits expected to be paid under the retirement plans as of September 30, 2021 are as follows:
PensionSERP
Expected Benefit Payments:  
Fiscal year ending September 30, 2022$320,000 $35,000 
Fiscal year ending September 30, 2023$470,000 $97,000 
Fiscal year ending September 30, 2024$533,000 $123,000 
Fiscal year ending September 30, 2025$526,000 $122,000 
Fiscal year ending September 30, 2026$519,000 $121,000 
Fiscal years ending September 30, 2027 through 2031$2,840,000 $636,000 
Schedule of year-end target allocation, by asset category, and the actual asset allocations
The Company’s year-end target allocation, by asset category, and the actual asset allocations were as follows:
 
 TargetSeptember 30,
Asset CategoryAllocation20212020
Cash and other
0% - 15%
—%—%
Fixed income securities
15% - 40%
31%52%
Equity securities
45% - 75%
69%48%
Schedule of pension plan assets at fair value
The following tables set forth by level, within the fair value hierarchy, pension plan assets at their fair value:
  Fair Value Measurements Using:
Carrying
Amount
as of
September 30,
2021		Quoted
Prices in
Active
Markets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Financial Assets:    
Cash$25,000 $25,000 $— $— 
Corporate bonds1,000 1,000 — — 
Fixed income exchange-traded funds3,809,000 3,809,000 — — 
Preferred securities48,000 48,000 — — 
Equity securities exchange-traded funds459,000 459,000 — — 
Equities8,252,000 8,252,000 — — 
Total$12,594,000 $12,594,000 $— $— 
  Fair Value Measurements Using:
 Carrying
Amount
as of
September 30,
2020		Quoted
Prices in
Active
Markets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Financial Assets:    
Corporate bonds$1,000 $1,000 $— $— 
Fixed income exchange-traded funds5,762,000 5,762,000 — — 
Equity securities exchange-traded funds352,000 352,000 — — 
Equities4,936,000 4,936,000 — — 
Total$11,051,000 $11,051,000 $— $—