CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net income	$ 454	$ 4,385
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,301	3,168
Amortization of debt issuance costs and debt discount	1,513	1,432
Amortization of deferred financing costs	270
Provision for doubtful accounts	(15)	(58)
Non-cash stock compensation	3,146	1,664
Deferred income taxes	(1,099)	1,405
Environmental charge	902	170
Earnings on equity investment in joint venture	(231)	(325)
Changes in assets and liabilities:
Trade accounts receivable	21,137	9,141
Other receivables	149	464
Inventory	2,225	(6,105)
Prepaid expenses and other current assets	(944)	(978)
Other assets	(334)	(305)
Accounts payable	7,699	3,135
Accrued expenses and other liabilities	792	(6,543)
Net cash provided by operating activities	43,965	10,650
Investing activities:
Purchases of investments	(2,655)	(1,017)
Sales of investments	1,646
Payments for intangible assets	(54)	(1,594)
Purchases of property and equipment, net	(1,506)	(541)
Net cash used in investing activities	(2,569)	(3,152)
Financing activities:
Payment of cash dividends	(1,935)	(1,954)
Proceeds from exercise of stock options	73	185
Excess tax benefit on stock option exercises and restricted stock		437
Repayment of bank loans	(23,783)	(49)
Net cash used in financing activities	(25,645)	(1,381)
Effect of exchange rate changes on cash	669	197
Net increase in cash	16,420	6,314
Cash and cash equivalents at beginning of period	55,680	66,828
Cash and cash equivalents at end of period	$ 72,100	$ 73,142