Revenue Recognition (Details Narrative) - Bellco [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) Products $ / shares	Mar. 31, 2020 USD ($)
Number of units under first tier royalty receivable | Products	125,000
First tier royalty per unit	$ 2.10
Second tier royalty per unit	$ 1.50
License Agreement [Member]
Royalty income | $	$ 14	$ 16
EURO Currency [Member]
First tier royalty per unit	$ 1.75
Second tier royalty per unit	$ 1.25