EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018
Earnings Per Share [Abstract]
Net (loss) income attributable to Heska Corporation	$ (241)	$ 1,897	$ 573	$ 4,052	$ 4,052
Basic weighted-average common shares outstanding (in shares)	7,486	7,226	7,463		7,146
Assumed exercise of dilutive stock options and restricted shares	0	624	493		635
Diluted weighted-average common shares outstanding	7,486	7,850	7,956		7,781
Basic (loss) earnings per share attributable to Heska Corporation (in dollars per share)	$ (0.03)	$ 0.26	$ 0.08		$ 0.57
Diluted (loss) earnings per share attributable to Heska Corporation (in dollars per share)	$ (0.03)	$ 0.24	$ 0.07		$ 0.52
Stock Options And Restricted Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and restricted units excluded from computation of earnings per share	714	169	225		238

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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