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Income Taxes (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Income Tax Contingency [Line Items]                        
Deferred Tax Assets, Valuation Allowance $ 11,040,259       $ 11,112,376       $ 11,040,259 $ 11,112,376    
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 387,558       1,021,275       387,558 1,021,275    
TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit                 0 (852,523) $ 10,500,000  
Unrecognized Tax Benefits 4,351,811       4,043,623       4,351,811 4,043,623 6,946,229 $ 7,264,966
Income tax expense 2,721,000 $ 356,000 $ 1,312,000 $ 2,363,000 6,984,000 $ 834,000 $ 3,604,000 $ 4,559,000 $ 6,751,965 $ 15,981,057 47,757,808  
U.S. federal income tax rate (in hundredths)                 21.00% 31.55%    
Valuation allowance for deferred tax assets 1,274               $ 1,274      
Total gross unrecognized tax benefits including interest 5,800,000       5,800,000       5,800,000 $ 5,800,000 8,800,000  
Unrecognized tax benefits that are permanent in nature and, if recognized, would affect the annual effective tax rate 5,200,000       5,400,000       5,200,000 5,400,000 6,900,000  
Accrued gross interest 1,400,000       1,800,000       1,400,000 1,800,000 1,900,000  
Current period gross interest expense                 (100,000) 1,100,000 400,000  
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions                 246,725 54,025 166,375  
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions                 786,674   8,228  
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities                 0 (1,356,714) 0  
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations                 725,211 1,461,512 493,340  
Foreign Earnings Repatriated                   17,100,000    
Deferred Tax Assets, Capital Loss Carryforwards 7,784,059       $ 7,856,176       7,784,059 7,856,176    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount                 7.8      
Operating Loss Carryforwards $ 54,318               54,318      
MEXICO                        
Income Tax Contingency [Line Items]                        
TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit                 $ 0 $ 0 $ 4,854,640