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Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment, Useful Life (Details)	12 Months Ended
	Dec. 31, 2019
Building and Building Improvements [Member] \| Minimum [Member]
Property and Equipment, Useful Life (Year)	3 years
Building and Building Improvements [Member] \| Maximum [Member]
Property and Equipment, Useful Life (Year)	40 years
Riverboats And Barges [Member] \| Minimum [Member]
Property and Equipment, Useful Life (Year)	5 years
Riverboats And Barges [Member] \| Maximum [Member]
Property and Equipment, Useful Life (Year)	40 years