Note 10 - Financial Information about Geographic Areas (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 14,722,000	$ 14,475,000	$ 49,756,000	$ 55,442,000
CANADA
Revenue from Contract with Customer, Including Assessed Tax	$ 103,000	$ 74,000	$ 1,119,000	$ 2,333,000