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Note 9 - Stock Options (Details Textual) - USD ($)
12 Months Ended
Sep. 15, 2020
Jul. 31, 2020
Jun. 29, 2020
Jan. 09, 2020
Jan. 06, 2020
Nov. 04, 2019
Mar. 08, 2019
Dec. 03, 2018
Oct. 31, 2020
Jul. 22, 2020
Nov. 01, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)                 4 years 266 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)                 2 years 211 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term (Year)                 4 years 262 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value                 $ 643,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value                 387,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value                 639,000    
Share-based Payment Arrangement, Nonemployee [Member]                      
Nonemployee Director, Annual Compensation                     $ 50,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Per Director (in shares) 5,757                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Value $ 25,000         $ 25,000          
Share Price, 20 Day Average (in dollars per share) $ 4.34         $ 6.36          
Incentive Stock Options [Member]                      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total                 $ 571,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                 4 years 32 days    
Restricted Stock [Member]                      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total                 $ 245,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                 324 days    
Restricted Stock [Member] | Share-based Payment Arrangement, Nonemployee [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Per Director (in shares)           3,270          
Two Employees [Member] | Incentive Stock Options [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       3,241       25,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares)       3,241       5,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number to Vest Each Year (in shares)               5,000      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)               4 years      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)               10 years      
One Employee [Member] | Incentive Stock Options [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)     10,000   50,000   25,000 10,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares)     2,500   10,000   5,000 2,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number to Vest Each Year (in shares)     2,500   10,000   5,000 2,000      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     3 years   4 years   4 years 4 years      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     10 years   10 years   10 years 10 years      
Two Officers and One Employee [Member]                      
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)       12,075              
Share-based Payment Arrangement, Expense       $ 77,000              
Three Officers and Two Employees [Member] | Incentive Stock Options [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       77,000              
Three Officers and Two Employees [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       38,500              
Three Officers and Two Employees [Member] | Restricted Stock and Incentive Stock Options [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       4 years              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       10 years              
Three Officers and Two Employees [Member] | Restricted Stock and Incentive Stock Options [Member] | Vesting on January 9, 2021 [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       25.00%              
Three Officers and Two Employees [Member] | Restricted Stock and Incentive Stock Options [Member] | Vesting Quarterly After January 9, 2021 [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       3 years              
Non-employee Directors and Chairperson of Committee on Board [Member]                      
Share Price, 20 Day Average (in dollars per share) $ 4.34                    
Annual Payable, Additional Compensation                 $ 15,000    
Stock Issued During Period, Shares, Per Person, Issued For Services (in shares)   279                  
Shares Issued, Price Per Share (in dollars per share)   $ 4.47                  
Annual Payable, Shares, Additional Compensation $ 15,000                    
Non-employee Directors and Chairperson of Committee on Board [Member] | Restricted Stock [Member]                      
Stock Issued During Period, Shares, Per Person, Issued For Services (in shares) 3,454                    
The 2020 Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)                   1,250,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)                 1,197,399