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(8) Segment Information: Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Sales, net $ 9,710 $ 11,340
Gross profit 5,538 6,766
Research & development 154 266
Amortization 509 513
Operating income 3,153 3,883
Income before provision for income taxes 3,858 4,798
Provision for income taxes 817 842
Net income 3,041 3,956
Single Operating Segment    
Sales, net 9,710 11,340
Standard cost of sales 3,656 3,822
Other cost of sales 516 753
Gross profit $ 5,538 $ 6,765
Gross Profit Margin 57.00% 59.70%
Selling and Marketing Expense $ 500 $ 411
Research & development 154 266
Litigation Expense 316 751
Amortization 509 513
Other Selling, General and Administrative Expense 906 941
Operating income $ 3,153 $ 3,883
Operating Income Margin 32.50% 34.20%
Other Interest and Dividend Income $ 737 $ 891
Other Operating Income (Expense), Net (32) 24
Income before provision for income taxes 3,858 4,798
Provision for income taxes 817 842
Net income $ 3,041 $ 3,956