Note 4 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Jul. 31, 2021	Aug. 01, 2020
Net sales	$ 144,732	$ 143,644
Transferred at Point in Time [Member]
Net sales	72,739	64,027
Transferred over Time [Member]
Net sales	71,993	79,617
Unique Configuration [Member]
Net sales	61,685	70,106
Limited Configuration [Member]
Net sales	71,603	63,581
Service and Other [Member]
Net sales	11,444	9,957
Commercial [Member]
Net sales	32,781	34,506
Commercial [Member] \| Transferred at Point in Time [Member]
Net sales	26,379	22,892
Commercial [Member] \| Transferred over Time [Member]
Net sales	6,402	11,614
Commercial [Member] \| Unique Configuration [Member]
Net sales	3,587	8,727
Commercial [Member] \| Limited Configuration [Member]
Net sales	25,907	22,555
Commercial [Member] \| Service and Other [Member]
Net sales	3,287	3,224
Live Events [Member]
Net sales	52,387	51,474
Live Events [Member] \| Transferred at Point in Time [Member]
Net sales	6,829	6,214
Live Events [Member] \| Transferred over Time [Member]
Net sales	45,558	45,260
Live Events [Member] \| Unique Configuration [Member]
Net sales	41,508	41,975
Live Events [Member] \| Limited Configuration [Member]
Net sales	5,842	5,419
Live Events [Member] \| Service and Other [Member]
Net sales	5,037	4,080
High School Park and Recreation [Member]
Net sales	27,894	28,943
High School Park and Recreation [Member] \| Transferred at Point in Time [Member]
Net sales	21,941	19,368
High School Park and Recreation [Member] \| Transferred over Time [Member]
Net sales	5,953	9,575
High School Park and Recreation [Member] \| Unique Configuration [Member]
Net sales	4,166	7,668
High School Park and Recreation [Member] \| Limited Configuration [Member]
Net sales	22,957	20,688
High School Park and Recreation [Member] \| Service and Other [Member]
Net sales	771	587
Transportation [Member]
Net sales	12,558	14,498
Transportation [Member] \| Transferred at Point in Time [Member]
Net sales	5,571	6,374
Transportation [Member] \| Transferred over Time [Member]
Net sales	6,987	8,124
Transportation [Member] \| Unique Configuration [Member]
Net sales	6,541	7,724
Transportation [Member] \| Limited Configuration [Member]
Net sales	5,352	6,266
Transportation [Member] \| Service and Other [Member]
Net sales	665	508
International [Member]
Net sales	19,112	14,223
International [Member] \| Transferred at Point in Time [Member]
Net sales	12,019	9,179
International [Member] \| Transferred over Time [Member]
Net sales	7,093	5,044
International [Member] \| Unique Configuration [Member]
Net sales	5,883	4,012
International [Member] \| Limited Configuration [Member]
Net sales	11,545	8,653
International [Member] \| Service and Other [Member]
Net sales	$ 1,684	$ 1,558