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Note 9 - Acquisitions (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Note 9 - Acquisitions (Details) [Line Items]      
Number of Businesses Acquired   4  
Selling, General and Administrative Expenses [Member]      
Note 9 - Acquisitions (Details) [Line Items]      
Business Combination, Acquisition Related Costs     $ 9,000,000
IBwave Solutions and Fiberoptics [Member]      
Note 9 - Acquisitions (Details) [Line Items]      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   $ 28,000,000  
Business Combination, Contingent Consideration, Liability $ 13,000,000   $ 13,000,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability $ 0    
Patents, Trademarks, Trade Names, Customer Lists and Other [Member]      
Note 9 - Acquisitions (Details) [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     10 years