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Note 18 - Commitments and Contingencies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2016	Feb. 09, 2015
Contractual Obligation, Term (Year)	10 years
Long-term Debt, Total	$ 122,400,000
City of Westminster, Maryland [Member] | Loan to Finance WFN Construction [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 21,000,000.0
Debt Instrument, Term of Interest Only Payments (Year)		5 years
Debt Instrument, Term (Year)		30 years
Long-term Debt, Total	$ 17,500,000
Guarantee Obligations [Member] | Lease and Network Operations Agreement [Member] | Ting Fiber Inc. [Member]
Loss Contingency, Debt Service Guarantee, Revenue Shortfall Difference, Lower Threshold			$ 50,000
Loss Contingency, Debt Service Guarantee, Revenue Shortfall Difference, Upper Threshold			$ 150,000

X

- Definition

The length of term for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line and other contractual obligations.

+ References

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 210
-SubTopic 10
-Section S99
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