Note A - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

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

	(In thousands)
	MARKETABLE SECURITIES
	Amortized Cost		Fair Value		Gross Unrealized Gains		Gross Unrealized Losses
December 31, 2023
Certificates of Deposit		21,305		21,331		58		31
Variable Rate Demand Notes		5,123		5,123		-		-
Total Marketable Securities	$	26,428	$	26,454	$	58	$	31
December 31, 2022
Fixed Rate Municipal Bonds	$	11,460	$	11,405	$	-	$	58
Certificates of Deposit		9,895		9,820		22		94
Variable Rate Demand Notes		3,638		3,638		-		-
Total Marketable Securities	$	24,993	$	24,863	$	22	$	152

Schedule of Goodwill [Table Text Block]

	(In thousands)
	GOODWILL
	Defense		Safety
Balance at December 31, 2021	$	11,485	$	3,832
Additions		7,088		-
Less: Impairments		-		(3,832	)
Balance at December 31, 2022	$	18,573	$	-
Additions		860		-
Balance at December 31, 2023	$	19,433	$	-

Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table Text Block]

	(In thousands)
	INTANGIBLE ASSETS
	Technology Software and Other			Contracts/ Customer Relationships			Trade Secrets		Total
December 31, 2023
Gross Carrying Amount	$	290		$	6,058		$	1,000	$	7,348
Accumulated Amortization		(290	)		(1,768	)		-		(2,058	)
Net intangible assets	$	-		$	4,290		$	1,000	$	5,290
December 31, 2022
Gross Carrying Amount	$	290		$	6,058		$	1,000	$	7,348
Accumulated Amortization		(97	)		(325	)		-		(422	)
Net intangible assets	$	193		$	5,733		$	1,000	$	6,926

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Years ending December 31:	(In thousands)
2024	$	1,515
2025		1,515
2026		1,260
	$	4,290

Schedule of Product Warranty Liability [Table Text Block]

	(In thousands)
	Year Ended December 31
	2023			2022
Beginning balance January 1	$	521		$	218
Accruals during the period		1,548			3,026
Charges / payments made under the warranties		(1,703	)		(2,723	)
Balance December 31	$	366		$	521