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Note 2 - Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   

December 31,

 
   

2019

   

2018

 

Currency translation adjustments (1)

  $ (27,241 )   $ (41,107 )

Derivative hedging activity

    (4,522 )     1,715  

Pension activity

    (931 )     (898 )

Total accumulated other comprehensive loss

  $ (32,694 )   $ (40,290 )
Schedule of Weighted Average Number of Shares [Table Text Block]
   

Years Ended December 31,

 
   

2019

   

2018

   

2017

 

Weighted average number of common shares used for basic EPS

    31,130,222       32,345,382       33,150,949  

Effect of dilutive stock options and restricted and deferred stock unit awards

          652,621        

Weighted average number of common shares and dilutive potential common stock used for dilutive EPS

    31,130,222       32,998,003       33,150,949  
Restrictions on Cash and Cash Equivalents [Table Text Block]
   

December 31,

 

Balance sheet data

 

2019

   

2018

 

Cash and cash equivalents

  $ 64,874     $ 83,527  

Restricted cash

    1,348       1,359  

Cash, cash equivalents and restricted cash

  $ 66,222     $ 84,886  
Schedule of Variable Interest Entities [Table Text Block]
   

December 31,

 

Balance sheet data

  2019       2018  

Current assets

  $ 18,304     $ 33,066  

Non-current assets

    7,635       6,466  

Current liabilities

    8,261       12,953  

Non-current liabilities

    1,962       8,780  
   

Years Ended December 31,

 

Statement of operations data

 

2019 (1)

    2018 (2)       2017  

Revenue

  $ 28,403     $ 49,809     $ 91,947  

Gross profit

    9,508       9,898       15,194  

Net (income) loss attributable to Aegion Corporation

    (1,100 )     (1,374 )     3,432