Note 1 - Business and Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2018
Furniture and Fixtures [Member]
Equipment (Year)	5 years
Building and Building Improvements [Member]
Equipment (Year)	39 years
Minimum [Member] | Equipment [Member]
Equipment (Year)	2 years
Minimum [Member] | Leasehold Improvements [Member]
Equipment (Year)	5 years
Minimum [Member] | Software and Software Development Costs [Member]
Equipment (Year)	3 years
Maximum [Member] | Equipment [Member]
Equipment (Year)	5 years
Maximum [Member] | Leasehold Improvements [Member]
Equipment (Year)	10 years
Maximum [Member] | Software and Software Development Costs [Member]
Equipment (Year)	10 years