Note 7 - Selected Balance Sheet Accounts - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accrued employee-related benefits	$ 1,517	$ 1,782
Other accrued expenses	289	201
Amounts due to customers	64	77
Other current liabilities	364	332
Other accrued expenses and other current liabilities	717	610
Total accrued expenses and other current liabilities	$ 2,234	$ 2,392