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Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Net product revenue $ 2,790,000 $ 1,925,000 $ 4,342,000 $ 3,889,000
Cost of products sold 1,300,000 995,000 2,049,000 2,098,000
Gross profit 1,490,000 930,000 2,293,000 1,791,000
Selling, general and administrative expenses 531,000 520,000 1,088,000 1,060,000
Operating income 959,000 410,000 1,205,000 731,000
Interest income, net 4,000 6,000 8,000 9,000
Other (expense)income, net (310,000) 175,000 (393,000) 189,000
Income before income taxes 653,000 591,000 820,000 929,000
Income tax benefit(provision) (40,000) (1,000) 1,835,000 (2,000)
Net income 613,000 590,000 2,655,000 927,000
Other comprehensive income:        
Foreign currency translation adjustment 12,000 (3,000) (5,000) (16,000)
Comprehensive income $ 625,000 $ 587,000 $ 2,650,000 $ 911,000
Net income per share: Basic (in Dollars per share) $ 0.1 $ 0.1 $ 0.45 $ 0.16
Diluted (in Dollars per share) 0.1 0.1 0.45 0.16
Cash dividends declared per common share (in Dollars per share) $ 0.145 $ 0.04 $ 0.19 $ 0.08
Common Class A [Member]        
Other comprehensive income:        
Weighted average shares outstanding: Basic (in Shares) 5,936,180 5,824,847 5,906,180 5,824,847
Common Class B [Member]        
Other comprehensive income:        
Weighted average shares outstanding: Diluted (in Shares) 5,994,180 5,914,847 5,950,180 5,909,847