Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING ACTIVITIES:
Net income (loss)	$ 8,911	$ 8,669
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	2,792	2,113
Deferred income taxes	(68)	(328)
Stock-based compensation expense	1,119	767
Provision for losses on accounts receivable	120	(180)
Gain on disposition of capital assets	(20)	(32)
Changes in operating assets and liabilities:
Trade receivables	(3,516)	(2,205)
Inventories	(3,343)	(1,799)
Other current assets	(908)	(102)
Other assets	(53)	17
Accounts payable - trade	1,419	(578)
Accrued liabilities	(754)	2,292
Other long-term liabilities	(90)	(217)
Deferred compensation	569	203
Net cash provided by operating activities	6,178	8,620
INVESTING ACTIVITIES:
Purchases of investments	(844)	(690)
Proceeds from sales of investments	166	346
Proceeds from sale of capital assets	20	32
Capital expenditures	(5,652)	(5,255)
Net cash (used in) provided by investing activities	(6,310)	(5,567)
FINANCING ACTIVITIES:
Dividends paid	(3,148)	(1,856)
Proceeds from issuance of common stock	1,047	187
Net cash used in financing activities	(2,101)	(1,669)
Increase (decrease) in cash and cash equivalents	(2,233)	1,384
Cash and cash equivalents at beginning of year	13,970	17,889
Cash and cash equivalents at end of year	11,737	19,273
SUPPLEMENTAL INFORMATION CASH PAID DURING THE PERIOD FOR:
Income taxes paid (refunded)	6,120	3,980
Capital Expenditures Incurred but Not yet Paid	$ 60	$ 1,200