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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 |

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