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BENEFIT PLANS - Additional information (Details)	1 Months Ended		3 Months Ended		9 Months Ended
	Nov. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) shares	Jan. 31, 2022 USD ($)	Jan. 31, 2021 USD ($)	Jan. 31, 2022 USD ($)	Jan. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			$ 67,000	$ 90,000	$ 200,000	$ 270,000
Share-based Compensation, Total					178,000	132,000
Percentage of options exercisable	100
Term of options from the date of grant	10 years
Threshold period after ceases from employment for automatic termination of options	3 months
Threshold period after ceases from employment on account of disability for automatic termination of options	1 year
Threshold period after ceases from employment on account of death for automatic termination of options	1 year
Fair value of options	$ 252,000
Expected volatility	38.04%
Average risk-free interest rate	1.46%
Dividend yield	0.00%
Expected life	7 years 6 months
Non cash compensation expense			16,000		16,000
Issuance of common stock settled from deferred common share units (in shares) | shares		12,411
Issuance of common stock settled from deferred common share units		$ 20,000
Accrued compensation expense related to the deferred stock units					8,000	8,000
Board of Directors Chairman [Member]
Defined Benefit Plan Disclosure [Line Items]
Non Cash Director Fee Compensation			23,000	15,000	68,000	58,000
Equity Plan [Member] | President and Chief Executive Officer
Defined Benefit Plan Disclosure [Line Items]
Stock option issued during the year | shares	50,000
Exercise price | $ / shares	$ 14.24
PBGC [Member]
Defined Benefit Plan Disclosure [Line Items]
Payment for Pension Benefits					$ 1,847,000
Restricted Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average remaining vesting period					3 years
Restricted Stock [Member] | Equity Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Share-based Compensation, Total			25,000	20,000	$ 72,000	27,000
Unrecognized compensation expense related to restricted shares			$ 111,000	$ 53,000	$ 111,000	$ 53,000

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