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Note 1 - Summary of Significant Accounting Policies (Details Textual 1)
$ in Millions
Dec. 31, 2018
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01  
Summary Of Significant Accounting Policies [Line Items]  
Unrecognized revenue from unsatisfied performance obligations $ 70
Unsatisfied performance obligations, expected to be recognized 35.00%
Unsatisfied performance obligations, expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01  
Summary Of Significant Accounting Policies [Line Items]  
Unsatisfied performance obligations, expected to be recognized 30.00%
Unsatisfied performance obligations, expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01  
Summary Of Significant Accounting Policies [Line Items]  
Unsatisfied performance obligations, expected to be recognized 15.00%
Unsatisfied performance obligations, expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01  
Summary Of Significant Accounting Policies [Line Items]  
Unsatisfied performance obligations, expected to be recognized 20.00%
Unsatisfied performance obligations, expected timing of satisfaction