Note 3 - Supplemental Balance Sheet Information (in Thousands) - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets, Gross, Total	$ 5,833	$ 5,652
Less accumulated amortization	(3,793)	(3,357)
Intangible assets, net	2,040	2,295
Customer Contracts And Lists [Member]
Finite-Lived Intangible Assets, Gross, Total	3,543	3,362
Trade Names [Member]
Finite-Lived Intangible Assets, Gross, Total	900	900
Patents [Member]
Finite-Lived Intangible Assets, Gross, Total	870	870
Noncompete Agreements [Member]
Finite-Lived Intangible Assets, Gross, Total	$ 520	$ 520