Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Jul. 01, 2018	3,746,454	1,414,517
Balance at Jul. 01, 2018	$ 374,645	$ 141,452	$ 7,854,108	$ 2,102,745	$ 14,010,725
Cash dividends paid					(903,170)
Reclassification of unrealized gain on available-for-sale securities from other comprehensive income to retained earnings				(2,102,745)	2,102,745
Net earnings for the quarter					440,381
Net earnings for the quarter					440,381
Balance (in shares) at Sep. 30, 2018	3,746,454	1,414,517
Balance at Sep. 30, 2018	$ 374,645	$ 141,452	7,854,108		15,650,681
Cash dividends paid					(903,170)
Balance (in shares) at Jul. 01, 2018	3,746,454	1,414,517
Balance at Jul. 01, 2018	$ 374,645	$ 141,452	7,854,108	2,102,745	14,010,725
Net earnings for the quarter						$ 2,804,066
Net earnings for the quarter						2,804,066
Balance (in shares) at Mar. 31, 2019	3,746,454	1,414,517
Balance at Mar. 31, 2019	$ 374,645	$ 141,452	7,854,108		16,208,025
Balance (in shares) at Sep. 30, 2018	3,746,454	1,414,517
Balance at Sep. 30, 2018	$ 374,645	$ 141,452	7,854,108		15,650,681
Cash dividends paid					(903,170)
Net earnings for the quarter					557,442
Net earnings for the quarter					557,442
Balance (in shares) at Dec. 30, 2018	3,746,454	1,414,517
Balance at Dec. 30, 2018	$ 374,645	$ 141,452	7,854,108		15,304,953
Cash dividends paid					(903,170)
Cash dividends paid					(903,171)
Net earnings for the quarter					1,806,243	1,806,243
Net earnings for the quarter					1,806,243	1,806,243
Balance (in shares) at Mar. 31, 2019	3,746,454	1,414,517
Balance at Mar. 31, 2019	$ 374,645	$ 141,452	7,854,108		16,208,025
Cash dividends paid					(903,171)
Balance (in shares) at Jun. 30, 2019	3,746,454	1,414,517
Balance at Jun. 30, 2019	$ 374,645	$ 141,452	7,854,108		15,549,961	23,920,166
Cash dividends paid					(903,170)
Net earnings for the quarter					285,325
Net earnings for the quarter					285,325
Balance (in shares) at Sep. 29, 2019	3,746,454	1,414,517
Balance at Sep. 29, 2019	$ 374,645	$ 141,452	7,854,108		14,932,116
Cash dividends paid					(903,170)
Balance (in shares) at Jun. 30, 2019	3,746,454	1,414,517
Balance at Jun. 30, 2019	$ 374,645	$ 141,452	7,854,108		15,549,961	23,920,166
Net earnings for the quarter						1,320,322
Net earnings for the quarter						1,320,322
Balance (in shares) at Mar. 29, 2020	3,746,454	1,414,517
Balance at Mar. 29, 2020	$ 374,645	$ 141,452	7,854,108		15,063,942	23,434,147
Balance (in shares) at Sep. 29, 2019	3,746,454	1,414,517
Balance at Sep. 29, 2019	$ 374,645	$ 141,452	7,854,108		14,932,116
Cash dividends paid					(903,171)
Net earnings for the quarter					877,675
Net earnings for the quarter					877,675
Balance (in shares) at Dec. 29, 2019	3,746,454	1,414,517
Balance at Dec. 29, 2019	$ 374,645	$ 141,452	7,854,108		14,906,620
Cash dividends paid					(903,171)
Net earnings for the quarter					157,322	157,322
Net earnings for the quarter					157,322	157,322
Balance (in shares) at Mar. 29, 2020	3,746,454	1,414,517
Balance at Mar. 29, 2020	$ 374,645	$ 141,452	$ 7,854,108		$ 15,063,942	$ 23,434,147