Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
OPERATING ACTIVITIES:
Net income	$ 8,669	$ 6,929
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	2,113	2,028
Changes in provision for losses on accounts receivable	(180)	890
Deferred income taxes	(328)	(809)
Stock-based compensation expense	767	844
(Gain) loss on disposition of capital assets	(32)	(108)
Changes in operating assets and liabilities:
Trade receivables	(2,205)	(754)
Inventories	(1,799)	(2,100)
Other current assets	(102)	(394)
Other assets	17	(5)
Accounts payable - trade	(578)	52
Accrued liabilities	2,292	(970)
Other long-term liabilities	(217)	345
Deferred compensation	203	71
Net cash used in operating activities	8,620	6,019
INVESTING ACTIVITIES:
Proceeds from sales of investments	346	307
Purchases of investments	(690)	(537)
Proceeds from sale of capital assets	32	143
Capital expenditures	(5,255)	(991)
Net cash used in investing activities	(5,567)	(1,078)
FINANCING ACTIVITIES:
Dividends paid	(1,856)	(1,336)
Proceeds from issuance of common stock	187	318
Net cash used in financing activities	(1,669)	(1,018)
Decrease in cash	1,384	3,923
Cash at beginning of period	17,889	8,278
Cash at end of period	19,273	12,201
SUPPLEMENTAL CASH FLOW INFORMATION - Cash paid during the period for:
Income taxes paid, net	3,980	6,039
Non-cash transactions:
Capital expenditures in current liabilities	$ 1,200	$ 0