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Note 18 - Commitments and Contingencies (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2016 | Feb. 09, 2015
Contractual Obligation, Term | 10 years |  |
Contractual Obligation, Total | $ 220,892,000 |  |
Long-term Debt, Total | 114,400,000 |  |
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 | 16,200,000 |  |
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
Fiber IRU [Member] |  |  |
Contractual Obligation, Total | $ 900,000 |  |

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