Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES:
Net income (loss)	$ 17,666	$ 23,786	$ 24,237
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	7,367	7,936	7,556
Deferred income taxes	286	1,606	2,731
Stock-based compensation expense	501	1,609	1,470
Excess tax benefit from stock-based payment arrangements		(1,494)	(1,761)
Provision for losses on accounts receivable	(100)	(100)	(100)
Gain on disposition of capital assets	(1,792)	(512)	(34)
Gain on life insurance policies			(346)
Changes in operating assets and liabilities:
Trade receivables	1,209	2,356	584
Inventories	3,193	(13,492)	27,938
Other current assets	(1,299)	1,036	(1,962)
Other assets	22	450	59
Accounts payable - trade	(1,874)	4,028	(6,877)
Accrued liabilities	2,546	477	2,052
Other long-term liabilities	(431)	(1,298)	(1,180)
Net cash provided by operating activities	27,294	26,388	54,367
INVESTING ACTIVITIES:
Purchases of investments	(42,230)	(30,537)	(3,100)
Proceeds from sales of investments	44,172	12,474	2,900
Proceeds from sale of capital assets	6,152	1,848	76
Proceeds from Life Insurance Policy			2,814
Capital expenditures	(29,447)	(13,457)	(7,382)
Net cash (used in) provided by investing activities	(21,353)	(29,672)	(4,692)
FINANCING ACTIVITIES:
Repayments of Short-term Debt			11,904
Dividends paid	(6,746)	(6,062)	(5,455)
Proceeds from issuance of common stock	233	1,078	1,591
Shares withheld for employee tax obligations	(552)	(1,132)	(170)
Excess Tax Benefit from Share-based Compensation, Financing Activities		(1,494)	(1,761)
Net cash used in financing activities	(7,065)	(4,622)	(14,177)
Increase (decrease) in cash and cash equivalents	(1,124)	(7,906)	35,498
Cash and cash equivalents at beginning of year	28,874	36,780	1,282
Cash and cash equivalents at end of year	27,750	28,874	36,780
SUPPLEMENTAL INFORMATION CASH PAID DURING THE PERIOD FOR:
Income taxes paid (refunded)	8,460	9,780	10,140
Capital Expenditures Incurred but Not yet Paid	$ 4,084	$ 1,740	$ 430