Note 16 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Net operating losses	$ 14,898	$ 11,773
Research tax credits	65	60
Stock compensation	1,216	847
Accruals and other	324	211
Deferred Tax Assets, Gross, Total	16,503	12,891
Depreciation and other	534	678
Deferred Tax Liabilities, Gross, Total	534	678
Net deferred tax assets	15,969	12,213
Less valuation allowance	(15,969)	(12,213)
Net deferred taxes after valuation allowance	$ 0	$ 0