Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ 10,637	$ 4,763	$ (720)
Adjustments to reconcile net income (loss):
Depreciation and amortization	2,225	2,072	979
Allowance for doubtful accounts	21	99	31
Amortization of deferred finance cost	154	75	112
Value of share-based payment arrangements	706	203	708
Excess tax benefits from stock option exercise	(189)	0	0
Deferred tax expense (benefit)	1,080	2,768	(857)
Other non cash (income) expenses	564	(302)	414
Changes in assets and liabilities (net of acquisitions):
Trade accounts receivable	(404)	(545)	(293)
Inventories	(6,704)	(23,430)	(1,150)
Prepaid and other assets	523	(465)	(548)
Income taxes payable	562	0	2,709
Accounts payable and accrued expenses	173	4,259	316
Cash provided (used) by operating activities	9,348	(10,503)	1,701
Cash flows from investing activities:
Payments for acquisitions	0	(2,424)	(7,368)
Additions to patents	0	(12)	(10)
Additions to property, plant and equipment	(1,733)	(889)	(716)
Investment in affiliates	0	0	63
Cash used in investing activities	(1,733)	(3,325)	(8,031)
Cash flows from financing activities:
Net proceeds from issuances of common stock	51,060	460	15,925
Excess tax benefits from stock-based compensation	189	0	0
(Repayments of) borrowing from short-term debt - net	(20,227)	14,172	(9,024)
Proceeds from long-term debt	61	292	0
Repayment of long-term debt	(4,349)	(328)	(305)
Payment of deferred acquisition cost	(1,676)	(445)	0
Cash provided by financing activities	25,058	14,151	6,596
Increase in cash and cash equivalents	32,673	323	266
Cash and cash equivalents at beginning of period	1,258	935	669
Cash and cash equivalents at end of period	33,931	1,258	935
Supplemental disclosure of cash flow information:
Cash paid during period for interest	964	701	529
Cash paid for income taxes	4,985	0	0
Non cash investing activity:
Deferred acquisition cost	$ 0	$ 1,982	$ 667