Note 2 - Summary of Significant Accounting Policies - Useful Lives of Property, Plant & Equipment (Details)	12 Months Ended
	Dec. 31, 2019
Buildings and Building Improvements [Member] | Minimum [Member]
Estimated useful life (Year)	10 years
Buildings and Building Improvements [Member] | Maximum [Member]
Estimated useful life (Year)	30 years
Telephone and Computer Equipment [Member] | Minimum [Member]
Estimated useful life (Year)	3 years
Telephone and Computer Equipment [Member] | Maximum [Member]
Estimated useful life (Year)	5 years
Furniture, Fixtures, and Miscellaneous Equipment [Member] | Minimum [Member]
Estimated useful life (Year)	5 years
Furniture, Fixtures, and Miscellaneous Equipment [Member] | Maximum [Member]
Estimated useful life (Year)	7 years
Computer Software [Member] | Minimum [Member]
Estimated useful life (Year)	3 years
Computer Software [Member] | Maximum [Member]
Estimated useful life (Year)	6 years