Note 4 - Intangible Assets and Goodwill - Goodwill and Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Intangible assets, net	$ 1,467,000	$ 1,591,000
Goodwill	781,000	781,000
Intangible assets, amortization and foreign exchange	(109,000)	(124,000)
Goodwill, foreign exchange
Intangible assets, net	1,358,000	1,467,000
Goodwill	$ 781,000	$ 781,000