Note 2 - Revenue Recognition 2 (Details Textual)	Dec. 31, 2019 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 83,915,000
Equipment Delivery, Installation and Configuration [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Amount	$ 1,090,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Business Broad Band, Voice and Managed IT Services [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | Minimum [Member]
Revenue, Remaining Performance Obligation, Amount	$ 82,825
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Business Broad Band, Voice and Managed IT Services [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	10 years