Note 4 - Business Combination, Contingent Consideration and Disposal of Branches (Details Textual)			1 Months Ended	2 Months Ended	10 Months Ended	12 Months Ended
	Sep. 11, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 31, 2020 USD ($)	Feb. 28, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Payments to Acquire Businesses, Gross						$ 4,945,000	$ 387,000
Business Combination, Contingent Consideration, Liability, Total					$ 10,401,000	10,401,000	1,620,000
Financing Receivable, after Allowance for Credit Loss, Total					1,229,000	1,229,000	$ 665,000
National Tax Branches [Member] | Discontinued Operations, Disposed of by Sale [Member]
Number of Branches Sold			1
Disposal Group, Including Discontinued Operation, Consideration			$ 636,000
Disposal Group, Including Discontinued Operation, Goodwill			239,000
Disposal Group, Including Discontinued Operation, Intangible Assets			100,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal			$ 297,000
Financing Receivable, Term (Month)			10 years
Financing Receivable, Weighted Average Interest Rate			3.00%
Certain Assets of a Tax Preparation and Accounting Business [Member]
Payments to Acquire Businesses, Gross				$ 387,000	582,000
Business Combination, Contingent Consideration, Liability, Total				1,428,000	2,177,000	$ 2,177,000
Certain Assets of a Tax Preparation and Accounting Business [Member] | Customer Relationships [Member]
Finite-lived Intangible Assets Acquired				$ 1,815,000	$ 2,759,000
Finite-Lived Intangible Asset, Useful Life (Year)				7 years	7 years
Winslow Targets [Member]
Payments to Acquire Businesses, Gross		$ 3,200,000
Business Combination, Contingent Consideration, Number of Annual Installments		3
Business Combination, Contingent Consideration Arrangements, Range Of Outcomes, Value, High, Net Operating Capital		$ 1,000,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low, Pre-Tax Net Earnings		1,500,000
Business Combination, Contingent Consideration Arrangements, Range Of Outcomes, Value, High, Pre-Tax Net Earnings		3,000,000
Escrow Deposit		$ 500,000
Winslow Targets [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		12 years
Winslow Targets [Member] | Brand Name [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		5 years
United Advisor Acquisition [Member]
Payments to Acquire Businesses, Gross	$ 2,790,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 4,500,000
United Advisor Acquisition [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	12 years