Note 6 - Goodwill and Intangible Assets (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill, Period Increase (Decrease), Total	$ 0
Goodwill, Ending Balance	61,614,000	$ 61,614,000	$ 57,255,000
Goodwill, Impairment Loss	0	0
Amortization of Intangible Assets	180,000	$ 320,000	318,000
Finite-Lived Intangible Asset, Expected Amortization, Year Two	140,000
Finite-Lived Intangible Asset, Expected Amortization, Year Three	140,000
Finite-Lived Intangible Asset, Expected Amortization, Year Four	140,000
Finite-Lived Intangible Asset, Expected Amortization, after Year Five	$ 0
Canadian Subsidiary [Member]
Goodwill, Impairment Loss			$ 714,000