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Stockholders' Equity (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Feb. 26, 2020
Mar. 18, 2019
Mar. 11, 2019
Equity, Class of Treasury Stock [Line Items]              
Weighted average common shares outstanding 770,000 1,122,000 751,000 1,887,000      
Conversion price           $ 188.73  
Market price $ 127.28 $ 91.10 $ 127.28 $ 91.10      
Foreign currency translation gain $ 29,700 $ 47,000.0 $ 59,900 $ 19,400      
Stock repurchase program, authorized amount $ 0   $ 0        
Share Repurchase Plan [Member]              
Equity, Class of Treasury Stock [Line Items]              
Stock repurchase program, number of shares authorized         5,000,000.0    
Stock repurchase program, authorized amount         $ 250,000,000   $ 120,000,000