Note 1 - Summary of Significant Accounting Policies - Intangible Assets (Details) (Parentheticals)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Customer Relationships [Member]
Weighted average life (Year)	12 years 8 months 12 days
Customer Relationships [Member] | Minimum [Member]
Weighted average life (Year)		7 years
Customer Relationships [Member] | Maximum [Member]
Weighted average life (Year)		15 years
Noncompete Agreements [Member]
Weighted average life (Year)	5 years 4 months 24 days
Noncompete Agreements [Member] | Minimum [Member]
Weighted average life (Year)		3 years
Noncompete Agreements [Member] | Maximum [Member]
Weighted average life (Year)		7 years