Note 5 - Goodwill and Other Intangible Assets, Net - Summary of Intangible Assets (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Other intangibles, gross	$ 12,033,000	$ 9,830,000
Less: accumulated amortization	2,477,615	2,271,691
Intangible assets, net	9,555,385	7,558,309
Customer-Related Intangible Assets [Member]
Other intangibles, gross	8,741,000	7,700,000
Noncompete Agreements [Member]
Other intangibles, gross	200,000	200,000
Trademarks [Member]
Other intangibles, gross	$ 3,092,000	$ 1,930,000