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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