Note 11 - Leases (Details Textual) - USD ($)	1 Months Ended
	Mar. 31, 2021	Jul. 31, 2020	Mar. 31, 2022	Dec. 31, 2021
Operating Lease, Right-of-Use Asset			$ 4,277,000	$ 3,530,000
Operating Lease, Liability, Current			500,000	670,000
Operating Lease, Liability, Noncurrent			3,777,000	2,860,000
Lease Agreement for a Building [Member]
Operating Lease, Payment Per Month	$ 34,000	$ 38,000
Lessee, Operating Lease, Discount Rate	11.00%
Operating Lease, Right-of-Use Asset			4,277,000	3,530,000
Operating Lease, Liability, Current			500,000	648,000
Operating Lease, Liability, Noncurrent			$ 3,777,000	$ 2,860,000