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Note 2 - Revenue Recognition - Revenue Accounted for In Accordance With ASC 606, By Timing of Revenue Recognition (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Total revenue $ 199,210
Transferred over Time [Member]  
Total revenue 170,101
Transferred at Point in Time [Member]  
Total revenue 5,127
Regulatory Revenue, Access [Member]  
Total revenue $ 23,982 [1]
[1] Includes customer ordered service and special access.