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Note 4 - Business Combination, Contingent Consideration, and Disposal of Branches - Contingent Consideration (Details) - Contingent Consideration [Member] - USD ($)
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Fair value of contingent consideration $ 1,620,000 $ 744,000
Fair value of contingent consideration in connection with acquisition   1,428,000
Payments (730,000) (617,000)
Change in fair value 311,000 65,000
Disposition/settlement of contingent consideration (540,000)  
Fair value of contingent consideration 10,401,000 $ 1,620,000
Certain Assets of a Tax Preparation and Accounting Business [Member]    
Fair value of contingent consideration in connection with acquisition 2,177,000  
Winslow Targets [Member]    
Fair value of contingent consideration in connection with acquisition 4,021,000  
United Advisor Acquisition [Member]    
Fair value of contingent consideration in connection with acquisition $ 3,542,000