Note 19 - Product and Geographic Segment Data - Assets by geographic Areas (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Assets	$ 31,321,086	$ 38,760,834
UNITED STATES
Assets	19,668,000	25,613,000
MEXICO
Assets	10,897,000	9,476,000
Other Geographic Areas [Member]
Assets	$ 756,000	$ 3,672,000