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Note 5 - Warranty (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
 
 
Three Months Ended
 
 
Six Months Ended
 
 
 
June 30,
 
 
June 30,
 
 
 
2016
 
 
2015
 
 
2016
 
 
2015
 
Beginning Balance
  $ 1,819     $ 1,203     $ 1,819     $ 1,167  
Add: Accruals for warranties issued during the period
    1,178       736       2,432       1,552  
Less: Settlements made during the period
    (997
)
    (685
)
    (2,251
)
    (1,465
)
Ending Balance
  $ 2,000     $ 1,254     $ 2,000     $ 1,254