Note 11 - Accounts Payable and Other Accrued Expenses (Details Textual) - USD ($)	1 Months Ended
	Jan. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Broker-Dealer, Payable to Other Broker-Dealer and Clearing Organization, Total		$ 151,000	$ 319,000
Accrued Exchange Fee Rebate		1,291,000	1,188,000
Accrued Professional Fees		130,000	119,000
Accrued Financial Obligation		312,000	595,000
Accrued Fixed Assets Payable		$ 493,000	380,000
Accrued Rent, Other			396,000
Accrued Clearing Fees			$ 228,000
System Implementation [Member]
Accrued Financial Obligation	$ 650,000
Product Financing Arrangement [Member] | System Implementation [Member]
Debt Instrument, Term (Month)	3 years