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Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net product revenue $ 1,925,000 $ 1,303,000 $ 3,889,000 $ 2,775,000
Cost of products sold 995,000 684,000 2,098,000 1,485,000
Gross profit 930,000 619,000 1,791,000 1,290,000
Selling, general and administrative expenses 520,000 519,000 1,060,000 1,117,000
Operating income 410,000 100,000 731,000 173,000
Interest income, net 6,000 10,000 9,000 21,000
Other income, net 175,000 10,000 189,000 17,000
Income before income taxes 591,000 120,000 929,000 211,000
Income tax provision (1,000) (1,000) (2,000) (2,000)
Net income 590,000 119,000 927,000 209,000
Other comprehensive income:        
Foreign currency translation adjustment (3,000) (5,000) (16,000) (5,000)
Comprehensive income $ 587,000 $ 114,000 $ 911,000 $ 204,000
Net income per share: Basic (in Dollars per share) $ 0.10 $ 0.02 $ 0.16 $ 0.04
Diluted (in Dollars per share) 0.10 0.02 0.16 0.04
Cash dividends declared per common share (in Dollars per share) $ 0.040 $ 0.035 $ 0.080 $ 0.070
Common Class A [Member]        
Other comprehensive income:        
Weighted average shares outstanding: Basic (in Shares) 5,824,847 5,800,347 5,824,847 5,787,014
Common Class B [Member]        
Other comprehensive income:        
Weighted average shares outstanding: Diluted (in Shares) 5,914,847 5,849,347 5,909,847 5,849,014