CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Capital Contributed in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Total
Balance at Apr. 30, 2020	$ 836	$ 51,334	$ 43,149	$ (6,467)	$ (4,215)	$ 84,637
Balance (in shares) at Apr. 30, 2020	8,358
Issuance of restricted common stock	$ 1	41	0	0	0	42
Issuance of restricted common stock (in shares)	9
Issuance of common stock settled from deferred common share units	$ 0	0	0	0	0	0
Issuance of common stock settled from deferred common share units (in shares)	12
Repurchase of common stock	$ (69)	(4,159)	0	0	0	(4,228)
Repurchase of common stock (in shares)	(687)
Net income	$ 0	0	1,391	0	0	1,391
Other comprehensive income	0	0	0	180	0	180
Balance at Oct. 31, 2020	$ 768	47,216	44,540	(6,287)	(4,215)	82,022
Balance (in shares) at Oct. 31, 2020	7,692
Balance at Jul. 31, 2020	$ 837	51,375	43,742	(6,377)	(4,215)	85,362
Balance (in shares) at Jul. 31, 2020	8,367
Issuance of common stock settled from deferred common share units	$ 0	0	0	0	0	0
Issuance of common stock settled from deferred common share units (in shares)	12
Repurchase of common stock	$ (69)	(4,159)	0	0	0	(4,228)
Repurchase of common stock (in shares)	(687)
Net income	$ 0	0	798	0	0	798
Other comprehensive income	0	0	0	90	0	90
Balance at Oct. 31, 2020	$ 768	47,216	44,540	(6,287)	(4,215)	82,022
Balance (in shares) at Oct. 31, 2020	7,692
Balance at Apr. 30, 2021	$ 730	45,072	47,710	(4,623)	0	88,889
Balance (in shares) at Apr. 30, 2021	7,323
Issuance of restricted common stock	$ 1	149	0	0	0	150
Issuance of restricted common stock (in shares)	13
Net income	$ 0	0	4,963	0	0	4,963
Other comprehensive income	0	0	0	133	0	133
Balance at Oct. 31, 2021	$ 731	45,221	52,673	(4,490)	0	94,135
Balance (in shares) at Oct. 31, 2021	7,336
Balance at Jul. 31, 2021	$ 731	45,221	49,347	(4,557)	0	90,742
Balance (in shares) at Jul. 31, 2021	7,336
Net income	$ 0	0	3,326	0	0	3,326
Other comprehensive income	0	0	0	67	0	67
Balance at Oct. 31, 2021	$ 731	$ 45,221	$ 52,673	$ (4,490)	$ 0	$ 94,135
Balance (in shares) at Oct. 31, 2021	7,336