Note 20 - Product and Geographic Segment Data - Assets by geographic Areas (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Assets	$ 21,550,971	$ 31,321,083
UNITED STATES
Assets	12,459,000	17,450,000
MEXICO
Assets	8,798,000	10,897,000
Other Geographic Areas [Member]
Assets	$ 294,000	$ 2,974,000