Note 5 - Leases (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Apr. 01, 2019
Lessee, Operating Lease, Liability, Payments, Due, Total	$ 2,924,000		$ 2,924,000			$ 5,800,000
Operating Lease, Weighted Average Remaining Lease Term (Year)	2 years 4 months 24 days		2 years 4 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	$ 314,000	628,000	$ 628,000
Variable Lease, Cost	71,000	59,000	137,000	118,000
Operating Lease, Right-of-Use Asset, Amortization Expense	265,000	$ 253,000	531,000	$ 502,000
Prepaid Rent	$ 110,000		$ 110,000		$ 158,000