Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
OPERATING ACTIVITIES:
Net income (loss)	$ 1,296	$ 6,180
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	1,903	1,847
Deferred income taxes	(376)	896
Stock-based compensation expense	549	353
Provision for losses on accounts receivable		(75)
Gain on disposition of capital assets	(33)	(1,842)
Changes in operating assets and liabilities:
Trade receivables	(2,325)	(3,377)
Inventories	5,919	(4,826)
Other current assets	(2)	(436)
Other assets
Accounts payable - trade	2,361	1,576
Accrued liabilities	563	1,089
Other long-term liabilities	43	147
Net cash provided by operating activities	9,898	1,532
INVESTING ACTIVITIES:
Purchases of investments	(10,016)	(8,022)
Proceeds from sales of investments	8,015	12,020
Proceeds from sale of capital assets	33	6,152
Capital expenditures	(10,434)	(5,075)
Net cash (used in) provided by investing activities	(12,402)	5,075
FINANCING ACTIVITIES:
Dividends paid	(1,729)	(1,565)
Proceeds from issuance of common stock	43	3
Shares withheld for employee tax obligations	(211)	(473)
Net cash used in financing activities	(1,897)	(2,035)
Increase (decrease) in cash and cash equivalents	(4,401)	4,572
Cash and cash equivalents at beginning of year	27,750	28,874
Cash and cash equivalents at end of year	23,349	33,446
SUPPLEMENTAL INFORMATION CASH PAID DURING THE PERIOD FOR:
Income taxes paid (refunded)		115
Capital Expenditures Incurred but Not yet Paid	$ 4,006	$ 2,080