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Note 4 - Connect (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Mar. 28, 2016
Mar. 07, 2016
Jul. 31, 2015
Jun. 30, 2013
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Payments to Noncontrolling Interests         $ 2,000,000 $ 2,789,000
Connect [Member]              
Payments to Noncontrolling Interests     $ 2,800,000        
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions             89.00%
Adjustments to Additional Paid-in Capital, Acquisition of Additional Ownership Interests           252,000 $ 2,800,000
Connect [Member] | Illuminate Health, LLC [Member]              
Payments to Noncontrolling Interests $ 1,000,000 $ 1,000,000          
Ownership Percentage Available to Acquire at Each Recurring Contract Value Target Level   33.33%          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent           $ 1,700,000  
Illuminate Health, LLC [Member]              
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners             11.00%
Connect [Member]              
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage       49.00%      
Connect [Member] | NG Customer-Connect, LLC [Member]              
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage       25.00%      
Connect [Member] | Illuminate Health, LLC [Member]              
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage       26.00%