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Note 17 - Commitments and Contingencies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019	Feb. 09, 2015
Contractual Obligation, Term	10 years
Operating Leases, Rent Expense, Total	$ 2,300,000	$ 1,900,000	$ 1,200,000
Long-term Debt, Total	65,156,000
City of Westminster, Maryland [Member] | Loan to Finance WFN Construction [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 21,000,000
Debt Instrument, Term of Interest Only Payments			5 years
Debt Instrument, Term			30 years
Long-term Debt, Total	$ 13,400,000
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
Subsequent Event [Member]
Operating Lease, Liability, Total				$ 7,400,000

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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Period of time in which only interest is paid under a debt agreement, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

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+ References

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 210
-SubTopic 10
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 20
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