Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
OPERATING ACTIVITIES:
Net income (loss)	$ 9,358	$ 8,911
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	3,088	2,792
Deferred income taxes	(57)	(68)
Stock-based compensation expense	1,135	1,119
Excess tax benefit from stock-based payment arrangements	(425)
Provision for losses on accounts receivable	1	120
Gain on disposition of capital assets	(22)	(20)
Changes in operating assets and liabilities:
Trade receivables	(4,319)	(3,516)
Inventories	317	(3,343)
Other current assets	(558)	(908)
Other assets	109	(53)
Accounts payable - trade	(61)	1,419
Accrued liabilities	2,134	(754)
Other long-term liabilities	573	(90)
Supplemental retirement plans	312	569
Net cash provided by operating activities	11,585	6,178
INVESTING ACTIVITIES:
Purchases of investments	(4,285)	(844)
Proceeds from sales of investments	3,957	166
Proceeds from sale of capital assets	31	20
Capital expenditures	(3,830)	(5,652)
Net cash (used in) provided by investing activities	(4,127)	(6,310)
FINANCING ACTIVITIES:
Dividends paid	(3,226)	(3,148)
Proceeds from issuance of common stock	1,714	1,047
Excess tax benefit from stock-based payment arrangements	425
Net cash used in financing activities	(1,087)	(2,101)
Increase (decrease) in cash and cash equivalents	6,371	(2,233)
Cash and cash equivalents at beginning of year	10,934	13,970
Cash and cash equivalents at end of year	17,305	11,737
SUPPLEMENTAL INFORMATION CASH PAID DURING THE PERIOD FOR:
Income taxes paid (refunded)	4,990	6,120
Capital Expenditures Incurred but Not yet Paid	$ 20	$ 60