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Note 2 - Business Acquisition (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended
Nov. 04, 2019
Nov. 01, 2019
Mar. 15, 2019
Apr. 30, 2020
Apr. 30, 2020
Oct. 31, 2019
Apr. 30, 2020
C Enterprises [Member]              
Payments to Acquire Businesses, Gross     $ 600,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total     0        
C Enterprises [Member] | Selling, General and Administrative Expenses [Member]              
Business Combination, Acquisition Related Costs     $ 100,000        
Schrofftech [Member]              
Payments to Acquire Businesses, Gross   $ 4,000,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total   $ 3,299,000          
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       $ 1,100,000 $ 2,300,000    
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual       $ (95,000) (13,000)    
Schrofftech [Member] | Selling, General and Administrative Expenses [Member]              
Business Combination, Acquisition Related Costs         $ 43,000 $ 108,000 $ 151,000