Note 8 - Leases (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Apr. 01, 2019
Lessee, Operating Lease, Liability, to be Paid, Total	$ 2,341,000		$ 5,800,000
Operating Lease, Weighted Average Remaining Lease Term	1 year 10 months 24 days
Lessee, Operating Lease, Discount Rate	6.50%
Operating Lease, Expense, Excluding Maintenance Fee and Other Expense, Monthly	$ 105,000
Operating Lease, Expense	314,000,000,000	$ 314,000,000,000
Variable Lease, Cost	300,000	200,000
Operating Lease, Right-of-Use Asset, Amortization Expense	1,100,000	1,000,000.0
Prepaid Rent	$ 65,000	$ 158,000