EARNINGS PER SHARE (Details) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 31, 2010	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) $ / shares shares
Earnings Per Share [Abstract]
Reverse stock split conversion ratio	0.10
Net income after equity in losses of unconsolidated affiliates | $		$ 814	$ 2,155
Basic weighted-average common shares outstanding (in shares)		7,459	7,102
Assumed exercise of dilutive stock options and restricted shares		506	609
Diluted weighted-average common shares outstanding		7,965	7,711
Basic earnings per share attributable to Heska Corporation (in dollars per share) | $ / shares		$ 0.11	$ 0.30
Diluted earnings per share attributable to Heska Corporation (in dollars per share) | $ / shares		$ 0.10	$ 0.28
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		86	244