Note 9 - Goodwill and Other Intangible Assets - (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Apr. 01, 2021	May 01, 2020
Goodwill, Ending Balance	$ 59,894,000	$ 53,862,000
Goodwill, Period Increase (Decrease), Total	6,000,000.0
Goodwill, Written off Related to Sale of Business Unit	168,000
Goodwill, Impaired, Accumulated Impairment Loss	0
Amortization of Intangible Assets, Total	1,600,000	$ 1,200,000	$ 905,000
Acquisition of SSW [Member]
Goodwill, Ending Balance				$ 6,500,000
Goodwill, Acquired During Period	6,500,000
Pedestal [Member]
Goodwill, Ending Balance					$ 5,095,000
Goodwill, Business Acquisition Adjustments	$ 271,000