Note 7 - Leases - Components of Lease Expense and Cash Flows from Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Amortization of right-of use assets, included in cost of goods sold	$ 19	$ 22	$ 39	$ 43
Interest on lease liabilities	3	3	5	6
Fixed leases cost	129	128	258	257
Variable lease cost	40	37	86	75
Short-term lease cost	14	0	21	0
Total lease cost	205	190	409	381
Operating cash flows from finance leases	3	3	5	6
Operating cash flows from operating leases	129	128	258	257
Financing cash flows from finance leases	$ 22	$ 24	$ 46	$ 50