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Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net product revenue $ 2,300,000 $ 2,485,000 $ 6,642,000 $ 6,374,000
Cost of products sold 1,073,000 1,307,000 3,122,000 3,405,000
Gross profit 1,227,000 1,178,000 3,520,000 2,969,000
Selling, general and administrative expenses 536,000 467,000 1,624,000 1,527,000
Operating income 691,000 711,000 1,896,000 1,442,000
Interest income, net 14,000 6,000 22,000 15,000
Other (expense)income, net (96,000) (38,000) (489,000) 151,000
Income before income taxes 609,000 679,000 1,429,000 1,608,000
Income tax (provision)benefit (125,000) (1,000) 1,710,000 (3,000)
Net income 484,000 678,000 3,139,000 1,605,000
Other comprehensive income:        
Foreign currency translation adjustment 20,000 (9,000) 15,000 (25,000)
Comprehensive income $ 504,000 $ 669,000 $ 3,154,000 $ 1,580,000
Net income per share: Basic (in Dollars per share) $ 0.08 $ 0.12 $ 0.53 $ 0.27
Diluted (in Dollars per share) 0.08 0.11 0.53 0.27
Cash dividends declared per common share (in Dollars per share) $ 0.045 $ 0.04 $ 0.235 $ 0.12
Common Class A [Member]        
Other comprehensive income:        
Weighted average shares outstanding: Basic (in Shares) 5,996,180 5,861,180 5,936,180 5,838,699
Common Class B [Member]        
Other comprehensive income:        
Weighted average shares outstanding: Diluted (in Shares) 6,026,180 5,931,180 5,972,180 5,918,699