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Note 3 - Discontinued Operations (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Disposal Groups, Schedule of Gain (Loss) from Sale of Business [Table Text Block]
Cash proceeds from sale
  $
90,000
 
Less book value of assets sold:
       
Inventories
   
(5,947
)
Prepaid expenses
   
(250
)
Property and equipment
   
(7,051
)
Goodwill
   
(714
)
Deferred revenue
   
1,757
 
Liabilities
   
749
 
Gain on sale
  $
78,544
 
Schedule of Results from Discontinued Operations [Table Text Block]
Revenue
  $
24,418
 
Cost of revenue
   
(13,367
)
Operating expenses
   
(15,029
)
Other income
   
176
 
Gain on sale
   
78,544
 
Provision for income taxes
   
(1,799
)
Net income from discontinued operations
  $
72,943
 
Depreciation and amortization
  $
1,103
 
Stock-based compensation expense
   
2,194
 
Property and equipment expenditures
   
2,455