Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 11,157	[1]	$ 10,637	[1]	$ 4,763
Adjustments to reconcile net income to cash provided (used) in operating activities:
Depreciation	2,272		1,737		1,560
Amortization of intangible assets	1,107		488		512
Amortization of step-up of basis in inventories	833		0		0
Allowance for doubtful accounts	136		21		99
Amortization of deferred finance cost	218		154		75
Value of share-based payment arrangements	1,498		706		203
Excess tax benefits from stock option exercise	0		(189)		0
Deferred tax expense	4,005		1,080		2,768
Other non cash (income) expenses	0		564		(302)
Changes in assets and liabilities (net of acquisitions):
Trade accounts receivable	4,498		(404)		(545)
Inventories	(840)		(6,704)		(23,430)
Prepaid and other assets	(3,039)		523		(465)
Income taxes payable	(9,986)		562		0
Accounts payable and accrued expenses	6,026		173		4,259
Other liabilities	481		0		0
Cash provided (used) in operating activities	18,366		9,348		(10,503)
Cash flows from investing activities:
Payments for acquisitions	(208,969)		0		(2,424)
Additions to patents	0		0		(12)
Additions to property, plant and equipment	(1,022)		(1,733)		(889)
Cash used in investing activities	(209,991)		(1,733)		(3,325)
Cash flows from financing activities:
Net proceeds from issuances of common stock	807		51,060		460
Tax payment withholdings related to settlements of stock option awards	(2,026)		0		0
Excess tax benefits from stock-based compensation	0		189		0
Payment of deferred financing costs	(5,385)		0		0
(Repayments of) borrowing from short-term debt - net	65,000		(20,227)		14,172
Proceeds from long-term debt	105,000		61		292
Repayment of long-term debt	(172)		(4,349)		(328)
Payment of deferred acquisition cost	(528)		(1,676)		(445)
Cash provided by financing activities	162,696		25,058		14,151
Increase (decrease) in cash and cash equivalents	(28,929)		32,673		323
Cash and cash equivalents at beginning of period	33,931		1,258		935
Cash and cash equivalents at end of period	5,002		33,931		1,258
Supplemental disclosure of cash flow information:
Cash paid during period for interest	2,028		964		701
Cash paid for income taxes	6,829		4,985		0
Non cash investing activity:
Deferred acquisition cost	$ 0		$ 0		$ 1,982

[1] The sum of the net earnings per share may not add up to the full year amount due to rounding and because the quarterly calculations are based on varying numbers of shares outstanding.