Note 5 - Trade Accounts and Notes Receivable (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2020
Accounts Receivable, after Allowance for Credit Loss	$ 41,663	$ 20,157
Accounts Receivable, after Allowance for Credit Loss, Noncurrent	1,510	0
Product [Member]
Disposal Group, Including Discontinued Operation, Consideration			$ 12,500
Trade Accounts for Sale of Product [Member]
Accounts Receivable, after Allowance for Credit Loss	30,000
Accounts Receivable, after Allowance for Credit Loss, Noncurrent	1,500
Trade Accounts for Sale of Product [Member] | Letter of Credit [Member]
Accounts Receivable, after Allowance for Credit Loss	28,500
Promissory Note for Sale of Product [Member]
Financing Receivable, before Allowance for Credit Loss	$ 300	$ 1,200
Notes Receivable, Interest Rate, Stated Percentage			7.00%
Notes Receivable, Periodic Payment			$ 300