Note 11 - Financial Information about Geographic Areas (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 16,053,000	$ 14,722,000	$ 45,967,000	$ 49,756,000
CANADA
Revenue from Contract with Customer, Including Assessed Tax	$ 42,000	$ 103,000	$ 140,000	$ 1,119,000