Note 12 - Related Party Transactions (Details Textual) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Chalet [Member]
Number of Operating Leases	4		4
Finance Lease, Number of Lease	1		1
Related Party Transaction Number of Owners That Are Non-Independent Board Members of the Entity			4
Related Party Transaction, Expenses from Transactions with Related Party	$ 0.3	$ 0.2	$ 0.5	$ 0.5
Isely Family Land Trust LLC [Member]
Number of Operating Leases	1		1
Related Party Transaction, Expenses from Transactions with Related Party	$ 0.1	0.1	$ 0.2	0.2
FTVC, LLC [Member]
Number of Operating Leases	1		1
Related Party Transaction Number of Owners That Are Non-Independent Board Members of the Entity			4
FTVC, LLC [Member] | Maximum [Member]
Related Party Transaction, Expenses from Transactions with Related Party	$ 0.1	$ 0.1	$ 0.1	$ 0.1