Note 15 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Net operating losses	$ 11,773	$ 5,444
Research tax credits	60	45
Stock compensation	847	542
Accruals and other	211	169
Deferred Tax Assets, Gross, Total	12,891	6,200
Depreciation and other	678	396
Deferred Tax Liabilities, Gross, Total	678	396
Net deferred tax assets	12,213	5,804
Less valuation allowance	(12,213)	(5,804)
Net deferred taxes after valuation allowance	$ 0	$ 0