Note 10 - Income Taxes (Details Textual) - USD ($)	3 Months Ended			9 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Effective Income Tax Rate Reconciliation, Percent		(0.30%)	(0.30%)	(0.20%)	(0.40%)
Income Tax Expense (Benefit)		$ 57,000	$ 55,000	$ 136,000	$ 224,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total		$ 0		0
Effective Income Tax Rate Reconciliation, GILTI, Amount				$ 0	$ 0
Forecast [Member]
Effective Income Tax Rate Reconciliation, Percent	(0.30%)