Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
OPERATING ACTIVITIES:
Net income (loss)	$ 2,862	$ 12,401
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	3,734	3,633
Deferred income taxes	(35)	720
Stock-based compensation expense	871	592
Provision for losses on accounts receivable	(86)	(75)
Gain on disposition of capital assets	(42)	(1,794)
Changes in operating assets and liabilities:
Trade receivables	(1,346)	(5,014)
Inventories	2,299	(10,827)
Other current assets	(1,980)	(391)
Other assets
Accounts payable - trade	3,590	1,584
Accrued liabilities	946	325
Other long-term liabilities	117	146
Net cash provided by operating activities	10,930	1,300
INVESTING ACTIVITIES:
Purchases of investments	(12,572)	(20,099)
Proceeds from sales of investments	20,515	18,045
Proceeds from sale of capital assets	42	6,152
Capital expenditures	(17,462)	(12,902)
Net cash (used in) provided by investing activities	(9,477)	(8,804)
FINANCING ACTIVITIES:
Dividends paid	(3,463)	(3,290)
Proceeds from issuance of common stock	52	51
Shares withheld for employee tax obligations	(211)	(552)
Net cash used in financing activities	(3,622)	(3,791)
Increase (decrease) in cash and cash equivalents	(2,169)	(11,295)
Cash and cash equivalents at beginning of year	27,750	28,874
Cash and cash equivalents at end of year	25,581	17,579
SUPPLEMENTAL INFORMATION CASH PAID DURING THE PERIOD FOR:
Income taxes paid (refunded)	1,430	5,050
Capital Expenditures Incurred but Not yet Paid	$ 2,244	$ 1,826