v3.26.1
Note 13 - Treasury Stock and Repurchase Program (Details Textual) - USD ($)
 12 Months Ended
Nov. 17, 2025
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2022
Jul. 17, 2026
Oct. 31, 2025
Oct. 31, 2022
May 31, 2022
Mar. 31, 2022
Jul. 01, 2021
Apr. 30, 2021
Share Repurchase Program, Authorized, Amount               $ 2,000,000 $ 3,000,000 $ 3,000,000 $ 2,000,000 $ 2,000,000  
Share Repurchase Program, Remaining Authorized, Amount   $ 1,291,000 $ 758,000 $ 1,211,000 $ 1,266,000 $ 1,241,000             $ 474,000
Treasury Stock, Shares, Acquired 14,015 24,810 [1] 11,480 [2] 12,057 [2] 75,303 [2] 53,327 [3]              
Shares Acquired, Average Cost Per Share $ 37.04 $ 37.4 [1] $ 39.46 [2] $ 43.38 [2] $ 62.47 [2] $ 46.58 [3]              
Treasury Stock, Value, Acquired, Cost Method $ 519,121 $ 928,000 [1] $ 453,000 [2] $ 523,000 [2] $ 4,704,000 [2] $ 2,484,000 [3]              
Subsequent Event [Member]                          
Share Repurchase Program, Authorized, Amount             $ 2,000,000            
[1] (3)  Were acquired during the $3 million repurchase program authorized in October 2022 and the $2 million repurchase program authorized in October 2025. 
[2] (2)  Were acquired during the $3 million repurchase program authorized in May 2022 and the $3 million repurchase program authorized in October 2022. 
[3] (1)  Were acquired during the $2 million repurchase program authorized in July 2021 and the $2 million repurchase program authorized in March 2022. .