Note 1 - Business and Significant Accounting Policies - ROU Assets Useful Life (Details)	12 Months Ended
	Dec. 31, 2019
Automobiles [Member] | ROA Asset [Member]
Property, plant, and equipment estimated useful lives (Year)	5 years
Building [Member]
Property, plant, and equipment estimated useful lives (Year)	25 years
Building [Member] | ROA Asset [Member]
Property, plant, and equipment estimated useful lives (Year)	15 years
Minimum [Member] | Land [Member] | ROA Asset [Member]
Property, plant, and equipment estimated useful lives (Year)	1 year
Maximum [Member] | Land [Member] | ROA Asset [Member]
Property, plant, and equipment estimated useful lives (Year)	35 years