Note 6 - Contingent Consideration - Contingent Liability (Details) (Parentheticals)	3 Months Ended
	Dec. 31, 2022 USD ($)
Earnout Shares for Revenue Between $1 and $20,000,000 [Member] | Minimum [Member]
Aggregate net revenue	$ 1
Earnout Shares for Revenue Between $1 and $20,000,000 [Member] | Maximum [Member]
Aggregate net revenue	20,000,000
Earnout Shares for Revenue Between $20,000,001 and $60,000,000 [Member] | Minimum [Member]
Aggregate net revenue	20,000,001
Earnout Shares for Revenue Between $20,000,001 and $60,000,000 [Member] | Maximum [Member]
Aggregate net revenue	60,000,000
Earnout Shares for Revenue Between $60,000,001 and $140,000,000 [Member] | Minimum [Member]
Aggregate net revenue	60,000,001
Earnout Shares for Revenue Between $60,000,001 and $140,000,000 [Member] | Maximum [Member]
Aggregate net revenue	140,000,000
Earnout Shares for Revenue Between $140,000,001 and $300,000,000 [Member] | Minimum [Member]
Aggregate net revenue	140,000,001
Earnout Shares for Revenue Between $140,000,001 and $300,000,000 [Member] | Maximum [Member]
Aggregate net revenue	$ 300,000,000