Note 11 - Intangible Assets (Details Textual) - USD ($)	6 Months Ended	12 Months Ended
Apr. 30, 2020	Oct. 31, 2019
Amortization of Intangible Assets, Total	$ 346,000	$ 275,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)	8 years 142 days

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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