Note 2 - Summary of Significant Accounting Policies - Estimated Useful Lives of Property, Plant and Equipment (Details)	12 Months Ended
	Dec. 31, 2019
Building and Building Improvements [Member] | Minimum [Member]
Estimated useful lives of property and equipment (Year)	7 years
Building and Building Improvements [Member] | Maximum [Member]
Estimated useful lives of property and equipment (Year)	39 years
Machinery and Equipment [Member] | Minimum [Member]
Estimated useful lives of property and equipment (Year)	3 years
Machinery and Equipment [Member] | Maximum [Member]
Estimated useful lives of property and equipment (Year)	15 years
Vehicles [Member] | Minimum [Member]
Estimated useful lives of property and equipment (Year)	5 years
Vehicles [Member] | Maximum [Member]
Estimated useful lives of property and equipment (Year)	7 years