Note 8 - Cash Equivalents and Marketable Securities (Tables)

3 Months Ended

Dec. 30, 2017

Notes Tables

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

			Gross Unrealized				Estimated
	Cost		Gains		Losses		Fair Value
Money market mutual funds	$	1,007,294	$	-	$	-	$	1,007,294

			Accrued		Gross Unrealized				Estimated
	Cost		Interest		Gains		Losses		Fair Value
Money market mutual funds	$	851,195	$	-	$	-	$	-	$	851,195

Debt Securities, Held-to-maturity [Table Text Block]

	Cost		Accrued Interest		Amortization Bond Premium		Amortized Cost		Unrealized Losses			Estimated Fair Value
Municipal bonds	$	234,273	$	3,694	$	33,286	$	204,681	$	(101	)	$	204,580

	Cost		Accrued Interest		Amortization Bond Premium		Amortized Cost		Unrealized Gains		Estimated Fair Value
Municipal bonds	$	412,366	$	6,986	$	59,099	$	360,253	$	216	$	360,469