Note 1 - Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2019
Automobiles [Member]
Estimated useful lives (Year)	5 years
Equipment [Member] | Minimum [Member]
Estimated useful lives (Year)	5 years
Equipment [Member] | Maximum [Member]
Estimated useful lives (Year)	7 years
Office Equipment [Member] | Minimum [Member]
Estimated useful lives (Year)	5 years
Office Equipment [Member] | Maximum [Member]
Estimated useful lives (Year)	7 years
Equipment Leased to Other Party [Member] | Minimum [Member]
Estimated useful lives (Year)	5 years
Equipment Leased to Other Party [Member] | Maximum [Member]
Estimated useful lives (Year)	12 years
Leasehold Improvements [Member] | Minimum [Member]
Estimated useful lives (Year)	7 years
Leasehold Improvements [Member] | Maximum [Member]
Estimated useful lives (Year)	39 years