Note 11 - Financial Information about Geographic Areas (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 16,115,000	$ 17,373,000	$ 29,914,000	$ 35,034,000
CANADA
Revenue from Contract with Customer, Including Assessed Tax	$ 53,000	$ 542,000	$ 98,000	$ 1,016,000