Note 5 - Selected Balance Sheet Accounts - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accrued employee-related benefits	$ 1,782	$ 2,123
Other accrued expenses	201	143
Amounts due to customers	77	94
Other current liabilities	332	301
Other accrued expenses and other current liabilities	610	538
Total accrued expenses and other current liabilities	$ 2,392	$ 2,661