Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Mar. 31, 2019	Jul. 01, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 2,381,770	$ 1,008,433
Short-term investments	630,720	333,029
Marketable investment securities	6,857,904	6,641,650
Inventories	556,356	490,456
Prepaid expenses and other	543,368	760,561
Income taxes refundable	361,323	192,298
TOTAL CURRENT ASSETS	11,331,441	9,426,427
Net of accumulated depreciation of $41,434,454 and $41,264,023	18,369,161	18,698,651
OTHER ASSETS:
Cash surrender value-life insurance	717,733	717,733
Other	67,315	66,315
TOTAL OTHER ASSETS	785,048	784,048
TOTAL ASSETS	30,485,650	28,909,126
CURRENT LIABILITIES:
Accounts payable	552,430	806,487
Accrued expenses	744,297	1,107,226
Dividends payable	903,170	877,365
Other current liabilities	2,351,965	305,236
TOTAL CURRENT LIABILITIES	4,551,862	3,096,314
LONG-TERM DEFERRED COMPENSATION		17,440
DEFERRED INCOME TAXES	1,355,558	1,311,697
TOTAL LIABILITIES	5,907,420	4,425,451
COMMITMENTS AND CONTINGENCIES (Note 3)
STOCKHOLDERS' EQUITY
Preferred stock, par value $10 a share: Authorized and unissued, 2,000,000 shares
Additional paid-in capital	7,854,108	7,854,108
Accumulated other comprehensive earnings- Unrealized gain on available-for-sale securities, net of tax		2,102,745
Retained earnings	16,208,025	14,010,725
Balance	24,578,230	24,483,675
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	30,485,650	28,909,126
Common Class A [Member]
STOCKHOLDERS' EQUITY
Common Stock	374,645	374,645
Common Class B [Member]
STOCKHOLDERS' EQUITY
Common Stock	$ 141,452	$ 141,452