CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Capital Contributed in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss	Total
Balance at Apr. 30, 2021	$ 730	$ 45,072	$ 47,710	$ (4,623)	$ 88,889
Balance (in shares) at Apr. 30, 2021	7,323
Reclassification of common stock settled from deferred common share units	$ 2	(2)
Compensation related to issuance of option to purchase common stock		16			16
Issuance of deferred common share units		90			90
Issuance of restricted common stock	$ 1	149			150
Issuance of restricted common stock (in shares)	13
Net income			5,873		5,873
Other comprehensive income				200	200
Balance at Jan. 31, 2022	$ 733	45,325	53,583	(4,423)	95,218
Balance (in shares) at Jan. 31, 2022	7,336
Balance at Oct. 31, 2021	$ 731	45,221	52,673	(4,490)	94,135
Balance (in shares) at Oct. 31, 2021	7,336
Reclassification of common stock settled from deferred common share units	$ 2	(2)
Compensation related to issuance of option to purchase common stock		16			16
Issuance of deferred common share units		90			90
Net income			910		910
Other comprehensive income				67	67
Balance at Jan. 31, 2022	$ 733	45,325	53,583	(4,423)	95,218
Balance (in shares) at Jan. 31, 2022	7,336
Balance at Apr. 30, 2022	$ 524	32,383	54,828	(4,573)	83,162
Balance (in shares) at Apr. 30, 2022	5,240
Compensation related to issuance of option to purchase common stock		38			38
Issuance of deferred common share units		90			90
Issuance of restricted common stock	$ 2	162			164
Issuance of restricted common stock (in shares)	15
Net income			22,107		22,107
Other comprehensive income				1,820	1,820
Balance at Jan. 31, 2023	$ 526	32,673	76,935	(2,753)	107,381
Balance (in shares) at Jan. 31, 2023	5,255
Balance at Oct. 31, 2022	$ 526	32,570	60,361	(4,430)	89,027
Balance (in shares) at Oct. 31, 2022	5,255
Compensation related to issuance of option to purchase common stock		13			13
Issuance of deferred common share units		90			90
Net income			16,574		16,574
Other comprehensive income				1,677	1,677
Balance at Jan. 31, 2023	$ 526	$ 32,673	$ 76,935	$ (2,753)	$ 107,381
Balance (in shares) at Jan. 31, 2023	5,255