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Note 15 - Commitments and Contingencies (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 09, 2015
Contractual Obligation, Term | 10 years |  |  |
Operating Leases, Rent Expense | $ 1,200,000 | $ 1,000,000 | $ 900,000 |
Long-term Debt | 10,731,305 |  |  |
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 | $ 1,700,000 |  |  |
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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