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Note 16 - Subsequent Events (Details Textual) |  |  |  |  | 12 Months Ended |  |  |  |  |
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Feb. 01, 2017 USD ($) | Jan. 20, 2017 USD ($) | Aug. 18, 2016 USD ($) | Feb. 27, 2015 USD ($) | Jan. 20, 2018 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Oct. 01, 2018 | Oct. 01, 2017 | Apr. 01, 2017 | Mar. 01, 2017 USD ($) | Jan. 19, 2017 USD ($)
Bank of Montreal and Royal Bank of Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |
Maximum Total Funded Debt to EBITDA Ratio |  |  | 2 |  |  | 2.25 |  |  |  |  |  |  |
Minimum Fixed Charge Coverage Ratio |  |  |  |  |  | 1.2 |  |  |  |  |  |  |
Maximum Annual Capital Expenditures Requirement |  |  |  |  |  | $ 22,000,000 |  |  |  |  |  |  |
Line of Credit Facility, Maximum Funded Share Repurchases Ceiling |  |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  |
Maximum Ratio of Funded Share Repurchases to 12 Months Trailing EDITDA |  |  |  |  |  | 1.5 |  |  |  |  |  |  |
Debt Instrument, Term |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Bank of Montreal and Royal Bank of Canada [Member] | Total Loans Do Not Exceed 1.5 Times of Trailing 12 Months EBITDA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Funded Share Repurchases Ceiling |  |  |  |  |  | $ 40,000,000 |  |  |  |  |  |  |
Bank of Montreal and Royal Bank of Canada [Member] | Non-revolving Facility C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 40,000,000 |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  | 4,700,000 | $ 0 |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  | $ 40,000,000 |
Subsequent Event [Member] | Bank of Montreal and Royal Bank of Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 140,000,000 |  |  |  |  |  |  |  |  |  |  |
Maximum Total Funded Debt to EBITDA Ratio |  | 3 |  |  |  |  |  |  |  |  |  |  |
Minimum Fixed Charge Coverage Ratio |  | 1.2 |  |  |  |  |  |  |  |  |  |  |
Maximum Annual Capital Expenditures Requirement |  | $ 32,800,000 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Funded Share Repurchases Ceiling |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |
Maximum Ratio of Funded Share Repurchases to 12 Months Trailing EDITDA |  | 1.5 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Bank of Montreal and Royal Bank of Canada [Member] | Total Loans Do Not Exceed 1.5 Times of Trailing 12 Months EBITDA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Funded Share Repurchases Ceiling |  | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Bank of Montreal and Royal Bank of Canada [Member] | Debt to EBITDA is Greater Than or Equal to 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Threshold, Total Funded Debt to EBITDA Ratio |  | 2.25 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Bank of Montreal and Royal Bank of Canada [Member] | Non-revolving Facility C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 35,000,000 |  |  |  |  |  |  |  |  |  |  | $ 40,000,000
Subsequent Event [Member] | Bank of Montreal and Royal Bank of Canada [Member] | Non-revolving Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 85,000,000 |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  | $ 84,500,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast [Member] | Bank of Montreal and Royal Bank of Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Total Funded Debt to EBITDA Ratio |  |  |  |  |  |  |  |  | 2.25 | 2.5 | 2 |  |
eNom Incorporated [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 76,680,000 |  |  |  |  |  |  |  |  |  |  |
eNom Incorporated [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 83,500,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Estimated Price Adjusments |  |  |  |  | $ 6,800,000 |  |  |  |  |  |  |  |
Ting Virginia LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  | $ 3,135,140 |  |  | $ 357,492 |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  | $ 3,500,000 |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 70.00% |  |  |  |  |  |  |  |  |
Ting Virginia LLC [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 10.00% |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount that the loan facility may not exceed a specified funded share repurchases. + References No definition available. + Details
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- Definition The ratio for the maximum monetary amount funded share repurchases to 12 months trailing EBITDA. + References No definition available. + Details
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- Definition The maximum ration of debt to EBITDA, above which, certain covenants, stipulations, and conditions are applied to the credit facility. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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