Note 6 - Goodwill and Intangible Assets (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Nov. 30, 2021	Dec. 31, 2019
Equity, Fair Value Disclosure, Total			$ 111,000,000.0
Stockholders' Equity Attributable to Parent, Ending Balance	$ 96,959,000	$ 91,480,000	$ 92,300,000	$ 85,858,000
Goodwill, Impairment Loss	0	0
Amortization of Intangible Assets, Total	$ 185,000	$ 164,000