Note 4 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Oct. 30, 2021	Oct. 31, 2020	Oct. 30, 2021	Oct. 31, 2020
Net sales	$ 164,477	$ 127,367	$ 309,209	$ 271,011
Transferred at Point in Time [Member]
Net sales	76,434	64,078	149,173	128,105
Transferred over Time [Member]
Net sales	88,043	63,289	160,036	142,906
Unique Configuration [Member]
Net sales	75,533	51,243	137,218	121,349
Limited Configuration [Member]
Net sales	74,736	62,967	146,339	126,548
Service and Other [Member]
Net sales	14,208	13,157	25,652	23,114
Commercial [Member]
Net sales	34,463	30,356	67,244	64,862
Commercial [Member] \| Transferred at Point in Time [Member]
Net sales	26,362	23,226	52,741	46,118
Commercial [Member] \| Transferred over Time [Member]
Net sales	8,101	7,130	14,503	18,744
Commercial [Member] \| Unique Configuration [Member]
Net sales	4,559	3,508	8,146	12,235
Commercial [Member] \| Limited Configuration [Member]
Net sales	25,977	22,611	51,884	45,166
Commercial [Member] \| Service and Other [Member]
Net sales	3,927	4,237	7,214	7,461
Live Events [Member]
Net sales	59,396	37,822	111,783	89,296
Live Events [Member] \| Transferred at Point in Time [Member]
Net sales	11,508	6,736	18,337	12,950
Live Events [Member] \| Transferred over Time [Member]
Net sales	47,888	31,086	93,446	76,346
Live Events [Member] \| Unique Configuration [Member]
Net sales	43,528	27,302	85,036	69,277
Live Events [Member] \| Limited Configuration [Member]
Net sales	8,825	4,611	14,667	10,030
Live Events [Member] \| Service and Other [Member]
Net sales	7,043	5,909	12,080	9,989
High School Park and Recreation [Member]
Net sales	32,747	27,578	60,641	56,521
High School Park and Recreation [Member] \| Transferred at Point in Time [Member]
Net sales	23,115	19,718	45,056	39,086
High School Park and Recreation [Member] \| Transferred over Time [Member]
Net sales	9,632	7,860	15,585	17,435
High School Park and Recreation [Member] \| Unique Configuration [Member]
Net sales	6,908	5,091	11,074	12,759
High School Park and Recreation [Member] \| Limited Configuration [Member]
Net sales	24,916	21,696	47,873	42,384
High School Park and Recreation [Member] \| Service and Other [Member]
Net sales	923	791	1,694	1,378
Transportation [Member]
Net sales	14,053	15,323	26,611	29,821
Transportation [Member] \| Transferred at Point in Time [Member]
Net sales	4,634	5,930	10,205	12,304
Transportation [Member] \| Transferred over Time [Member]
Net sales	9,419	9,393	16,406	17,517
Transportation [Member] \| Unique Configuration [Member]
Net sales	8,976	8,975	15,517	16,699
Transportation [Member] \| Limited Configuration [Member]
Net sales	4,552	5,825	9,904	12,091
Transportation [Member] \| Service and Other [Member]
Net sales	525	523	1,190	1,031
International [Member]
Net sales	23,818	16,288	42,930	30,511
International [Member] \| Transferred at Point in Time [Member]
Net sales	10,815	8,468	22,834	17,647
International [Member] \| Transferred over Time [Member]
Net sales	13,003	7,820	20,096	12,864
International [Member] \| Unique Configuration [Member]
Net sales	11,562	6,367	17,445	10,379
International [Member] \| Limited Configuration [Member]
Net sales	10,466	8,224	22,011	16,877
International [Member] \| Service and Other [Member]
Net sales	$ 1,790	$ 1,697	$ 3,474	$ 3,255