Note 5 - Goodwill and Other Intangible Assets, Net - Summary of Intangible Assets (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Other intangibles, gross	$ 5,510,000	$ 5,510,000
Less: accumulated amortization	1,364,981	1,177,798
Intangible assets, net	4,145,019	4,332,202
Customer-Related Intangible Assets [Member]
Other intangibles, gross	4,970,000	4,970,000
Noncompete Agreements [Member]
Other intangibles, gross	200,000	200,000
Trademarks [Member]
Other intangibles, gross	$ 340,000	$ 340,000