Note 4 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 29, 2022	Jan. 29, 2022	Jan. 30, 2021	Jan. 29, 2022	Jan. 30, 2021
Net sales	$ 139,558	$ 139,558	$ 94,139	$ 448,767	$ 365,150
Transferred at Point in Time [Member]
Net sales	75,263		51,196	224,436	179,301
Transferred over Time [Member]
Net sales	64,295		42,943	224,331	185,849
Unique Configuration [Member]
Net sales	52,638		32,732	189,856	154,081
Limited Configuration [Member]
Net sales	73,363		50,254	219,702	176,802
Service and Other [Member]
Net sales	13,557		11,153	39,209	34,267
Commercial [Member]
Net sales	40,095		30,085	107,339	94,947
Commercial [Member] \| Transferred at Point in Time [Member]
Net sales	32,829		25,092	85,570	71,210
Commercial [Member] \| Transferred over Time [Member]
Net sales	7,266		4,993	21,769	23,737
Commercial [Member] \| Unique Configuration [Member]
Net sales	4,112		2,087	12,258	14,322
Commercial [Member] \| Limited Configuration [Member]
Net sales	32,081		24,630	83,965	69,796
Commercial [Member] \| Service and Other [Member]
Net sales	3,902		3,368	11,116	10,829
Live Events [Member]
Net sales	39,057		23,330	150,840	112,626
Live Events [Member] \| Transferred at Point in Time [Member]
Net sales	8,540		5,720	26,877	18,670
Live Events [Member] \| Transferred over Time [Member]
Net sales	30,517		17,610	123,963	93,956
Live Events [Member] \| Unique Configuration [Member]
Net sales	25,950		14,006	110,986	83,283
Live Events [Member] \| Limited Configuration [Member]
Net sales	6,843		4,536	21,510	14,566
Live Events [Member] \| Service and Other [Member]
Net sales	6,264		4,788	18,344	14,777
High School Park and Recreation [Member]
Net sales	23,721		14,644	84,362	71,165
High School Park and Recreation [Member] \| Transferred at Point in Time [Member]
Net sales	17,351		9,163	62,407	48,249
High School Park and Recreation [Member] \| Transferred over Time [Member]
Net sales	6,370		5,481	21,955	22,916
High School Park and Recreation [Member] \| Unique Configuration [Member]
Net sales	4,167		3,604	15,241	16,363
High School Park and Recreation [Member] \| Limited Configuration [Member]
Net sales	18,717		10,424	66,590	52,808
High School Park and Recreation [Member] \| Service and Other [Member]
Net sales	837		616	2,531	1,994
Transportation [Member]
Net sales	15,823		11,769	42,434	41,590
Transportation [Member] \| Transferred at Point in Time [Member]
Net sales	5,576		3,436	15,781	15,740
Transportation [Member] \| Transferred over Time [Member]
Net sales	10,247		8,333	26,653	25,850
Transportation [Member] \| Unique Configuration [Member]
Net sales	9,803		7,880	25,320	24,579
Transportation [Member] \| Limited Configuration [Member]
Net sales	5,269		3,273	15,173	15,364
Transportation [Member] \| Service and Other [Member]
Net sales	751		616	1,941	1,647
International [Member]
Net sales	20,862		14,311	63,792	44,822
International [Member] \| Transferred at Point in Time [Member]
Net sales	10,967		7,785	33,801	25,432
International [Member] \| Transferred over Time [Member]
Net sales	9,895		6,526	29,991	19,390
International [Member] \| Unique Configuration [Member]
Net sales	8,606		5,155	26,051	15,534
International [Member] \| Limited Configuration [Member]
Net sales	10,453		7,391	32,464	24,268
International [Member] \| Service and Other [Member]
Net sales	$ 1,803		$ 1,765	$ 5,277	$ 5,020