Note 9 - Fair Value of Assets and Liabilities - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)	Sep. 30, 2020	Sep. 30, 2019
Reported Value Measurement [Member]
Securities owned	$ 4,739,000	$ 12,481,000
Liabilities	10,401,000	1,620,000
Reported Value Measurement [Member] | Contingent Consideration [Member]
Liabilities	10,401,000	1,620,000
Reported Value Measurement [Member] | Equity Securities [Member]
Securities owned	137,000	6,282,000
Reported Value Measurement [Member] | Municipal Bonds [Member]
Securities owned	332,000	20,000
Reported Value Measurement [Member] | Restricted Stock [Member]
Securities owned	529,000	725,000
Reported Value Measurement [Member] | Warrant [Member]
Securities owned	3,303,000	5,454,000
Reported Value Measurement [Member] | Corporate Bond Securities [Member]
Securities owned	438,000
Estimate of Fair Value Measurement [Member]
Securities owned	4,739,000	12,481,000
Liabilities	10,401,000	1,620,000
Estimate of Fair Value Measurement [Member] | Contingent Consideration [Member]
Liabilities	10,401,000	1,620,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Securities owned	469,000	6,302,000
Liabilities
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Consideration [Member]
Liabilities
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Securities owned	3,195,000	2,254,000
Liabilities
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Consideration [Member]
Liabilities
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Securities owned	1,075,000	3,925,000
Liabilities	10,401,000	1,620,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Consideration [Member]
Liabilities	10,401,000	1,620,000
Estimate of Fair Value Measurement [Member] | Equity Securities [Member]
Securities owned	137,000	6,282,000
Estimate of Fair Value Measurement [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities owned	137,000	6,282,000
Estimate of Fair Value Measurement [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities owned
Estimate of Fair Value Measurement [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities owned
Estimate of Fair Value Measurement [Member] | Municipal Bonds [Member]
Securities owned	332,000	20,000
Estimate of Fair Value Measurement [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Securities owned	332,000	20,000
Estimate of Fair Value Measurement [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Securities owned
Estimate of Fair Value Measurement [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Securities owned
Estimate of Fair Value Measurement [Member] | Restricted Stock [Member]
Securities owned	529,000	725,000
Estimate of Fair Value Measurement [Member] | Restricted Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Securities owned
Estimate of Fair Value Measurement [Member] | Restricted Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Securities owned	529,000	725,000
Estimate of Fair Value Measurement [Member] | Restricted Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Securities owned
Estimate of Fair Value Measurement [Member] | Warrant [Member]
Securities owned	3,303,000	5,454,000
Estimate of Fair Value Measurement [Member] | Warrant [Member] | Fair Value, Inputs, Level 1 [Member]
Securities owned
Estimate of Fair Value Measurement [Member] | Warrant [Member] | Fair Value, Inputs, Level 2 [Member]
Securities owned	2,228,000	1,529,000
Estimate of Fair Value Measurement [Member] | Warrant [Member] | Fair Value, Inputs, Level 3 [Member]
Securities owned	1,075,000	$ 3,925,000
Estimate of Fair Value Measurement [Member] | Corporate Bond Securities [Member]
Securities owned	438,000
Estimate of Fair Value Measurement [Member] | Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities owned
Estimate of Fair Value Measurement [Member] | Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities owned	438,000
Estimate of Fair Value Measurement [Member] | Corporate Bond Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities owned