CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 9,456	$ 12,165	$ 5,519
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	4,754	4,645	4,187
Deferred income tax expense	8,864	3,932	1,327
Stock-based compensation	2,745	2,260	2,269
Other (gain) loss	(46)	(3)	36
Changes in operating assets and liabilities:
Accounts receivable	5,156	(4,700)	(4,216)
Inventories	(13,834)	(4,731)	(7,240)
Due from related parties	99	(59)	851
Lease receivable, current	(1,244)	(736)	(89)
Other current assets	(469)	883	(1,000)
Accounts payable	3,143	(688)	3,059
Due to related parties	250	1,356	(30)
Accrued liabilities and other	(1,293)	(351)	73
Lease receivable, non-current	(4,782)	(3,867)	(967)
Other non-current assets	(989)	(1,951)	(1,463)
Deferred revenue and other	(1,401)	(2,300)	(191)
Net cash provided by operating activities	10,409	5,855	2,125
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sale of equity investment	0	115	0
Purchase of minority interest	(13,757)	0	0
Purchases of property and equipment	(3,469)	(3,417)	(3,773)
Proceeds from disposition of property and equipment	57	0	0
Net cash used in investing activities	(17,169)	(3,302)	(3,773)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	2,452	2,382	2,143
Repurchase of common stock	(1,076)	(762)	(885)
Distributions to non-controlling interest members	(965)	0	0
Proceeds from line of credit borrowings	40,307	34,792	26,809
Repayments of line of credit borrowings	(34,979)	(34,262)	(26,714)
Repayments of other debt	(68)	(747)	(141)
Payment of debt issuance costs	(120)	0	0
Excess tax benefit from stock-based compensation	0	0	1,514
Net cash provided by financing activities	5,551	1,403	2,726
NET EFFECT OF EXCHANGE RATE CHANGES ON CASH	74	(52)	(43)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(1,135)	3,904	1,035
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	10,794	6,890	5,855
CASH AND CASH EQUIVALENTS, END OF YEAR	9,659	10,794	6,890
NON-CASH TRANSACTIONS:
Common stock issued as partial consideration of acquisition of Cuattro Veterinary International, LLC	$ 0	$ 6,349	$ 0