Note 9 - Stock-based Compensation (Tables)

12 Months Ended

Mar. 31, 2024

Notes Tables

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

	2024					2023
	Weighted-					Weighted-
	Average		Number of			Average		Number of
	Exercise		Options			Exercise		Options
	Price		Outstanding			Price		Outstanding
Outstanding at Beginning of Period	$	7.32		735,500		$	7.39		635,500
Granted		5.20		170,000			6.54		120,000
Exercised		-		-			4.92		(20,000	)
Expired		6.14		(10,000	)		-		-
Outstanding at End of Period		6.93		895,500			7.32		735,500
Exercisable at End of Period		7.41		665,500			7.42		499,000

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Fiscal Year Ended
	March 31, 2024									April 2, 2023
Number of options issued		40,000			10,000			120,000			120,000
Grant date	March 26, 2024			November 14, 2023			June 21, 2023			June 7, 2022
Dividend yield		6.07	%		7.60	%		6.08	%		4.89	%
Expected volatility		20.00	%		20.00	%		25.00	%		30.00	%
Risk free interest rate		4.38	%		4.56	%		4.29	%		2.95	%
Contractual term (years)		10.00			10.00			10.00			10.00
Expected term (years)		3.00			3.00			3.00			4.00
Forfeiture rate		5.00	%		5.00	%		5.00	%		5.00	%
Exercise price (grant-date closing price) per option	$	5.27		$	4.21		$	5.26		$	6.54
Fair value per option	$	0.32		$	0.20		$	0.46		$	0.90

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Fiscal Year Ended March 31, 2024
	Cost of		Marketing &
	Products		Administrative		Total
Options Granted in Fiscal Year	Sold		Expenses		Expense
2022	$	10	$	21	$	31
2023		22		32		54
2024		9		11		20
Total stock option compensation	$	41	$	64	$	105

	Fiscal Year Ended April 2, 2023
	Cost of		Marketing &
	Products		Administrative		Total
Options Granted in Fiscal Year	Sold		Expenses		Expense
2021	$	4	$	41	$	45
2022		40		86		126
2023		17		24		41
Total stock option compensation	$	61	$	151	$	212

Stock Granted in Fiscal Year	2024		2023
2021	$	-	$	48
2022		185		576
2023		195		269
2024		278		-
Total stock grant compensation	$	658	$	893

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

							Weighted-				Weighted-
					Weighted-		Avg. Exercise				Avg. Exercise
			Number		Avg. Remaining		Price of		Number		Price of
Exercise			of Options		Contractual		Options		of Options		Options
Price			Outstanding		Life in Years		Outstanding		Exercisable		Exercisable
$4.00	-	4.99		105,000		6.09	$	4.78		95,000	$	4.84
$5.00	-	5.99		180,000		8.84	$	5.33		20,000	$	5.90
$6.00	-	6.99		120,000		8.19	$	6.54		60,000	$	6.54
$7.00	-	7.99		365,500		5.22	$	7.74		365,500	$	7.74
$8.00	-	8.99		55,000		1.20	$	8.38		55,000	$	8.38
$9.00	-	9.99		70,000		2.19	$	9.60		70,000	$	9.60
				895,500		5.96	$	6.93		665,500	$	7.41

Schedule of Nonvested Share Activity [Table Text Block]

Number of Shares	Fair Value per Share		Grant Date	Vesting Period (Years)
60,412		$4.85	August 15, 2023	One
46,896		6.65	August 16, 2022	One
40,165		7.47	August 11, 2021	One
41,452		5.79	August 12, 2020	Two

Number of Shares	Fair Value per Share		Grant Date	Vesting Date
70,000		$5.27	March 26, 2024	March 26, 2027
26,000		4.77	August 14, 2023	August 14, 2024
40,000		5.85	March 21, 2023	March 21, 2025
25,000		7.98	June 9, 2021	June 9, 2022
10,000		7.60	February 22, 2021	February 22, 2023
20,000		4.92	June 10, 2020	June 10, 2022