Note F - Debt (Details Textual)					3 Months Ended		6 Months Ended
	Feb. 13, 2024 USD ($)	Feb. 13, 2024 USD ($)	Aug. 20, 2021 USD ($)	Aug. 18, 2021 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Aug. 23, 2021	Jun. 30, 2021 USD ($)	May 24, 2021 USD ($)
Payments to Acquire Property, Plant, and Equipment, Total							$ 1,707,000	$ 11,640,000
Interest Rate Swap [Member]
Derivative, Fixed Interest Rate				2.40%						2.40%
Manufacturing Facility and Warehouse [Member] | Carlsbad, California [Member]
Payments to Acquire Property, Plant, and Equipment, Total			$ 17,500,000
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity												$ 20,000,000
Debt Instrument Covenant Capital Expenditures Limitation, Amount, Next Twelve Years									$ 15,000,000		$ 10,000,000
Long-Term Debt							0
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Maximum [Member]
Debt Instrument Covenant Capital Expenditures Limitation, Amount, Next Twelve Years							7,500,000
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate				1.29%
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Subsequent Event [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 12,500,000	$ 12,500,000
Debt Instrument Covenant Minimum, Net Income Required	$ 1
Debt Instrument Covenant, Fixed Charge Coverage Ratio	1.25	1.25
Debt Instrument Covenant Capital Expenditures Limitation, Amount, After Twelve Years	$ 6,500,000	$ 6,500,000
Long-term Debt, Percentage Bearing Fluctuating Interest, Threshold Amount	$ 100,000	$ 100,000
Line of Credit Facility, Unused Commitment Fee	0.25%	0.25%
Debt Instrument Basis Spread on Elected Fixed Rate Borrowing	1.00%	1.00%
Line of Credit Facility, Maximum Loss Requirements, Third Quarter 2024					$ 2,000,000	$ 3,200,000
Line of Credit Facility, Availability Reserve		10.00%
Line of Credit Facility, Up Front Amendment Fee of the Maximum Borrowing Base	1.00%	1.00%
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Subsequent Event [Member] | Maximum [Member]
Debt Instrument Covenant Capital Expenditures Limitation, Amount, Next Twelve Years	$ 7,500,000	$ 7,500,000
Ratio of Indebtedness to Net Capital	1.5	1.5
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Subsequent Event [Member] | Minimum [Member]
Debt Instrument Covenant Capital Expenditures Limitation, Amount, Next Twelve Years	$ 6,500,000	$ 6,500,000
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Subsequent Event [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Term Loan [Member]
Debt Instrument, Face Amount				$ 10,000,000
Debt Instrument, Term (Year)				7 years
Long-Term Debt							$ 9,400,000
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Term Loan [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate				1.80%