CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Statement of Cash Flows [Abstract]
Stock issued for acquisitions	$ 6,349	$ 0	$ 0
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	12,165	5,519	1,599
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	4,645	4,187	3,712
Deferred tax expense	3,932	1,327	1,304
Stock based compensation	2,260	2,269	1,653
Unrealized (gain) loss on foreign currency translation	(3)	36	(81)
Changes in operating assets and liabilities:
Accounts receivable	(4,700)	(4,216)	(510)
Inventories	(4,731)	(7,240)	(5,592)
Other current assets	88	(238)	(73)
Accounts payable	(688)	3,059	900
Accrued liabilities and other	1,005	43	814
Other non-current assets	(5,818)	(2,430)	(263)
Deferred revenue and other	(2,300)	(191)	2,091
Net cash provided by operating activities	5,855	2,125	5,554
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sale of equity investment	115	0	0
Purchases of property and equipment	(3,417)	(3,773)	(2,337)
Proceeds from disposition of property and equipment	0	0	6
Net cash used in investing activities	(3,302)	(3,773)	(2,331)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock, net of distributions	1,620	1,258	1,430
Proceeds from (repayments of) line of credit borrowings, net	530	95	(4,751)
Repayments of other debt	(747)	(141)	(178)
Excess tax benefit from stock-based compensation	0	1,514	228
Net cash provided by (used in) financing activities	1,403	2,726	(3,271)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(52)	(43)	(113)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	3,904	1,035	(161)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	6,890	5,855	6,016
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 10,794	$ 6,890	$ 5,855