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Note 16 - Segment Reporting and Sales by Major Customer (Details Textual)	9 Months Ended
	Jan. 31, 2024
Number of Operating Segments	2
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| The Five Aerospace Customers [Member]
Concentration Risk, Percentage	27.30%
Number of Major Customers	5
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Top Customer [Member]
Concentration Risk, Percentage	13.80%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Next Top Four Customers [Member] \| Minimum [Member]
Concentration Risk, Percentage	1.60%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Next Top Four Customers [Member] \| Maximum [Member]
Concentration Risk, Percentage	8.10%