Note 5 - Goodwill and Intangible Assets (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 1.3
Finite-Lived Intangible Asset, Expected Amortization, Year Two	1.2
Finite-Lived Intangible Assets, Amortization Expense, Year Four	1.2
Finite-Lived Intangible Assets, Amortization Expense, Year Three	1.2
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 1.2
Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	15 years
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)	15 years
Noncompete Agreements [Member] | Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	1 year
Noncompete Agreements [Member] | Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years