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Note 3 - Acquisitions (Details Textual) $ in Thousands						3 Months Ended	12 Months Ended
	Jan. 01, 2020 USD ($) shares	Mar. 18, 2019 USD ($)	Feb. 13, 2018 USD ($)	Feb. 01, 2017 USD ($)	Feb. 27, 2015 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Combination, Acquisition Related Costs							$ 500	$ 300	$ 200
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual							4,700
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual							$ 700
Network Rights [Member]
Finite-Lived Intangible Asset, Useful Life (Year)							15 years
Ting Virginia LLC [Member]
Business Combination, Consideration Transferred, Total			$ 1,200
Payments for Repurchase of Redeemable Noncontrolling Interest			$ 1,200
Repurchase of Redeemable Noncontrolling Interest, Percentage			10.00%
Ting Virginia LLC [Member]
Business Acquisition, Percentage of Voting Interests Acquired				20.00%	70.00%
Business Combination, Consideration Transferred, Total				$ 2,000	$ 3,500
Business Combination, Interest Subject to Call Option, Not Exercised in Period				10.00%
Ascio Technologies, Inc. [Member]
Business Combination, Consideration Transferred, Total		$ 29,886
Business Combination, Consideration Transferred, Excluding Working Capital Deficiency Acquired		29,440
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital Deficiency		$ 450
Finite-Lived Intangible Asset, Useful Life (Year)		7 years
Cedar Holdings Group, Incorporated [Member]
Business Combination, Consideration Transferred, Total	$ 14,100
Business Combination, Consideration Transferred, Estimated Price Adjustments	200
Business Combination, Consideration Transferred, Net of Price Adjustments	13,900					$ 13,908
Payments to Acquire Businesses, Gross	$ 9,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares	32,374
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 2,000					$ 2,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	4,000
Business Combination, Contingent Consideration, Liability, Total	$ 3,100
Cedar Holdings Group, Incorporated [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	7 years
Cedar Holdings Group, Incorporated [Member] | Network Rights [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	15 years
Cedar Holdings Group, Incorporated [Member] | Measurement Input, Discount Rate [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.112

X

- Definition

Amount of estimated price adjustments that are expected to be incurred by the acquiring entity. Excludes cash.

+ References

No definition available.

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- Definition

Amount of consideration transferred excluding working capital deficiency acquired, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

No definition available.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer net of any price adjustments.

+ References

No definition available.

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X

- Definition

Represent the percentage of the acquiree subject to put and call option not exercised in period in a business combination.

+ References

No definition available.

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X

- Definition

Amount of working capital deficiency assumed at the acquisition date.

+ References

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X

- Definition

The percentage of redeemable noncontrolling interest that would be purchased during the period.

+ References

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X

- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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- Definition

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Value of input used to measure contingent consideration liability from business combination.

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- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The cash outflow during the period for redemption of redeemable noncontrolling interests.

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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