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Note 15 - Commitments and Contingencies (Details Textual) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jan. 16, 2018 | Jan. 05, 2018 | Feb. 09, 2015 USD ($)
Contractual Obligation, Term | 10 years |  |  |  |  |
Operating Leases, Rent Expense | $ 1,900,000 | $ 1,200,000 | $ 1,000,000 |  |  |
Long-term Debt | 77,753,638 |  |  |  |  |
Litigation Case with Namecheap [Member] | Subsequent Event [Member] |  |  |  |  |  |
Domain Name Transfer to Counter Party to Settle a Litigation Case |  |  |  | 2,650,000 | 2,650,000 |
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 | $ 7,500,000 |  |  |  |  |
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

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