Note 2 - Significant Accounting Policies - Summary of Property, Plant and Equipment Depreciation Rates (Details)	12 Months Ended
	Dec. 31, 2019
Minimum [Member]
Fiber network (years) (Year)	2 years
Maximum [Member]
Fiber network (years) (Year)	15 years
Computer Equipment [Member]
Computer equipment	30.00%
Computer Software [Member] | Minimum [Member]
Computer equipment	33.33%
Computer Software [Member] | Maximum [Member]
Computer equipment	100.00%
Furniture and Fixtures [Member]
Computer equipment	20.00%
Vehicles and Tools [Member]
Computer equipment	20.00%
Fiber Network [Member]
Fiber network (years) (Year)	15 years
Customer Equipment and Installations [Member]
Fiber network (years) (Year)	3 years
Leasehold Improvements [Member]
Leasehold improvements	Over term of lease
Asset under Construction [Member]
Fiber network (years) (Year)
Capitalized Internal Use Software [Member] | Minimum [Member]
Fiber network (years) (Year)	3 years
Capitalized Internal Use Software [Member] | Maximum [Member]
Fiber network (years) (Year)	7 years