Note 4 - Leases, Right-to-use Assets and Related Liabilities (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)	Dec. 31, 2021
Operating Lease, Liability, Total	$ 1,663
Lessee, Operating Lease, Lease Not yet Commenced, Amount	2
Operating Lease, Lease Income, Total	$ 100
Northwest Iowa, Land Lease Agreement [Member] | Forecast [Member]
Lessee, Operating Lease, Term of Contract (Year)		10 years
Deposits and Other Assets [Member]
Operating Lease, Right-of-Use Asset	1,700
Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Total	$ 1,900