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Note 2 - Business Acquisition (Details Textual) - Schrofftech [Member] - USD ($)
12 Months Ended 36 Months Ended
Nov. 04, 2019
Nov. 01, 2019
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2021
Payments to Acquire Businesses, Gross $ 4,000,000 $ 4,000,000        
Business Combination, Contingent Consideration Arrangements, Target Period (Year) 2 years          
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 2,400,000          
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual     $ 5,950,000      
Selling, General and Administrative Expenses [Member]            
Business Combination, Acquisition Related Costs     $ 0 $ 43,000 $ 108,000 $ 151,000