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Note 5 - Sale of Business Component (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Condensed Income Statement [Table Text Block]
   
Years Ended December 31,
 
   
201
7
   
201
6
 
Pre-tax profit related to facilities maintenance business
  $
-
    $
812
 
Pre-tax profit related to specific customer contract
  $
93
    $
478
 
Sale of Business Component, Pro Forma Adjustments to Income Statement [Table Text Block]
   
Years ended December 31,
 
(unaudited, in thousands)
 
2017
   
2016
 
   
(Pro forma)
   
(Pro forma)
 
                 
Revenue
  $
18,311
    $
22,845
 
Net income (loss)
  $
358
    $
(2,655
)
Basic and diluted net income (loss) per share
  $
0.02
    $
(0.17
)