Note 2 - Accounting Policies - Property and Equipment Allocations to Reportable Segments (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Property and equipment, net	$ 28,254,000	$ 30,418,000
Domestic Segment [Member]
Property and equipment, net	25,557,000	27,223,000
Foreign Segment [Member]
Property and equipment, net	$ 2,697,000	$ 3,195,000