Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
OPERATING ACTIVITIES:
Net income (loss)	$ 6,180	$ 4,752
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	1,847	2,032
Deferred income taxes	896	699
Stock-based compensation expense	353	639
Excess tax benefit from stock-based payment arrangements		(1,034)
Provision for losses on accounts receivable	(75)	(100)
Gain on disposition of capital assets	(1,842)	(63)
Changes in operating assets and liabilities:
Trade receivables	(3,377)	1,884
Inventories	(4,826)	(794)
Other current assets	(436)	1,247
Other assets		(133)
Accounts payable - trade	1,576	2,307
Accrued liabilities	1,089	346
Other long-term liabilities	147	(548)
Net cash provided by operating activities	1,532	11,234
INVESTING ACTIVITIES:
Purchases of investments	(8,022)	(790)
Proceeds from sales of investments	12,020	768
Proceeds from sale of capital assets	6,152	63
Capital expenditures	(5,075)	(4,491)
Net cash (used in) provided by investing activities	5,075	(4,450)
FINANCING ACTIVITIES:
Dividends paid	(1,565)	(1,386)
Proceeds from issuance of common stock	3	588
Shares withheld for employee tax obligations	(473)	(1,132)
Excess Tax Benefit from Share-based Compensation, Financing Activities		(1,034)
Net cash used in financing activities	(2,035)	(896)
Increase (decrease) in cash and cash equivalents	4,572	5,888
Cash and cash equivalents at beginning of year	28,874	36,780
Cash and cash equivalents at end of year	33,446	42,668
SUPPLEMENTAL INFORMATION CASH PAID DURING THE PERIOD FOR:
Income taxes paid (refunded)	115	(1,224)
Capital Expenditures Incurred but Not yet Paid	$ 2,080	$ 2