Note 4 - Balance Sheet Components - Loss From Abandonment and (or) Disposal of Obsolete Equipment, by Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loss on disposal or abandonment of assets	$ 1,321	$ 3,139	$ 16,985
North America Segment [Member]
Loss on disposal or abandonment of assets	(992)	2,378	17,699
International [Member]
Loss on disposal or abandonment of assets	$ 2,313	$ 761	$ (714)