Note 2 - Revenue Recognition 2 (Details Textual) $ in Thousands	Sep. 30, 2018 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 104,022
Equipment Delivery, Installation and Configuration [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue, Remaining Performance Obligation, Amount	$ 1,118
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]: 2018-10-01
Revenue, Remaining Performance Obligation, Amount	$ 102,904
Business Broad Band, Voice and Managed IT Services [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 | Minimum [Member]
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]: 2018-10-01 | Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	10 years