Note 11 - Financial Information about Geographic Areas (Details Textual) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from Contract with Customer, Including Assessed Tax	$ 30,027,000	$ 30,027,000	$ 12,027,000	$ 73,681,000	$ 35,745,000
AUSTRALIA
Revenue from Contract with Customer, Including Assessed Tax	$ 4,514,000			$ 6,567,000