Note 7 - Property, Plant and Equipment (Details Textual) - U1A Acquisition [Member] $ in Thousands	12 Months Ended
	Jul. 31, 2022 USD ($)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total	$ 13,004	[1]
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	21 years

[1] The fair value of property, plant and equipment was determined using a replacement cost approach.