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Note 2 - Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
(In thousands)
         
Adoption of
         
   
As Reported
   
ASC 606
   
As Adjusted
 
Costs and estimated earnings in excess of billings
  $
8,397
    $
(8,397
)   $
---
 
Contract assets
   
---
     
8,397
     
8,397
 
Billings in excess of costs and estimated earnings
   
466
     
(466
)    
---
 
Contract liabilities
   
---
     
466
     
466