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Note 10 - Subsequent Events (Details Textual) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 01, 2017 | Apr. 03, 2017 | May 31, 2016 | Sep. 30, 2017 | May 01, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2017 | May 01, 2017 | Jun. 30, 2017 | Feb. 07, 2017 | Dec. 31, 2016
Goodwill |  |  |  |  |  | $ 571,708 |  |  |  |  |  | $ 485,318
Proceeds from Issuance of Long-term Debt |  |  |  |  |  | 556,438 | $ 425,000 |  |  |  |  |
Scenario, Forecast [Member] | FCC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Reverse Auction for Broadcast Spectrum |  |  |  |  |  |  |  | $ 90,800 |  |  |  |
The 2017 Senior Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  |  |  |  |  | $ 4,600 |  |  |  |  |  |
The 2017 Senior Credit Facility [Member] | The 2017 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Quarterly Principal Payment |  |  |  |  |  |  |  |  |  |  | $ 1,400 |
The 2017 Senior Credit Facility [Member] | The 2017 Term Loan [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Quarterly Principal Payment |  |  |  |  |  |  |  |  |  | $ 1,600 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 33,000 |  |  |  | $ 33,000 |  |  |  | $ 33,000 |  |  |
Subsequent Event [Member] | The 2017 Senior Credit Facility [Member] | The 2017 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  | $ 85,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Quarterly Principal Payment |  | 1,600 |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  | 400 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |  |  |  |  |  |  |  |  |  |
Clarksburg Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 16,500 |  |  |  |  |  |  |  |  |
Clarksburg Acquisition [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  | 26,500 |  |  |
Payments to Acquire Businesses, Gross | $ 10,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 3,000 |  |  |  | 3,000 |  |  |  | 3,000 |  |  |
Bangor Acquisition and Gainesville Acquisition [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  | 85,000 |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 68,000 |  |  |  |  |  |  |  |  |  |
Goodwill | $ 30,000 |  |  |  | $ 30,000 |  |  |  | $ 30,000 |  |  |
Burlington and Plattsburg Acquisition [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  | $ 29,000 |  |  |  |  |  |  |  |

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