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Note 10 - Revenue - Remaining Performance Obligations 2 (Details)
Dec. 31, 2018
USD ($)
Revenue, remaining performance obligation, amount $ 143,340
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Revenue, remaining performance obligation, expected timing of satisfaction, period (Year) 1 year
Revenue, remaining performance obligation, amount $ 116,398
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Revenue, remaining performance obligation, expected timing of satisfaction, period (Year) 1 year
Revenue, remaining performance obligation, amount $ 12,751
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Revenue, remaining performance obligation, expected timing of satisfaction, period (Year) 1 year
Revenue, remaining performance obligation, amount $ 5,498
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Revenue, remaining performance obligation, expected timing of satisfaction, period (Year) 1 year
Revenue, remaining performance obligation, amount $ 3,456
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Revenue, remaining performance obligation, expected timing of satisfaction, period (Year) 1 year
Revenue, remaining performance obligation, amount $ 2,163
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Revenue, remaining performance obligation, expected timing of satisfaction, period (Year)
Revenue, remaining performance obligation, amount $ 3,074