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Income Taxes (Details 1) - 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
Investments, Owned, Federal Income Tax Note [Line Items]                      
Deferred Tax Assets, Valuation Allowance, Current $ 1,274               $ 1,274    
TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit                 0 $ (852,523) $ 10,500,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 3,000,000.0               3,000,000.0    
Operating Loss Carryforwards 54,318               54,318    
Deferred Income Tax Expense (Benefit) [Abstract]                      
Deferred income tax benefit                 572,914 (3,655,751) 8,785,432
Income tax expense reconciliation to U.S. federal tax rate [Abstract]                      
Expected income tax                 7,330,983 18,874,500 30,556,455
Discontinued Operation, Tax Effect of Discontinued Operation                 0 626,583 (243,321)
Increase (reduction) in income taxes resulting from:                      
State tax (excluding state tax credits), net of federal benefit                 3,398,271 1,576,915 2,249,055
Revalue deferred tax assets and liabilities                     10,516,827
Uncertain tax positions                 (167,455) (183,929) (340,993)
Other, net                 (277,058) 412,635 59,478
Income taxes 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
Effective Income Tax Rate Reconciliation, Tax Credit, Amount                 7,616,236 0 0
Deferred tax assets:                      
Allowance for doubtful accounts 23,900,236       20,162,369       23,900,236 20,162,369  
Unearned insurance commissions 9,964,655       9,308,138       9,964,655 9,308,138  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits 12,730,245       9,271,182       12,730,245 9,271,182  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals 1,205,082       1,011,584       1,205,082 1,011,584  
Deferred Tax Assets, Tax Credit Carryforwards, Foreign 3,254,926               3,254,926    
Convertible notes         3,254,926         3,254,926  
Gross deferred tax assets 84,536,602       51,885,650       84,536,602 51,885,650  
Less valuation allowance (11,040,259)       (11,112,376)       (11,040,259) (11,112,376)  
Net deferred tax assets 73,496,343       40,773,274       73,496,343 40,773,274  
Deferred tax liabilities:                      
Fair value adjustment for loans (14,065,135)       (9,589,188)       (14,065,135) (9,589,188)  
Property and equipment (5,097,147)       (2,426,786)       (5,097,147) (2,426,786)  
Intangible assets (925,319)       (1,610,258)       (925,319) (1,610,258)  
Deferred net loan origination fees (1,664,486)       (1,593,385)       (1,664,486) (1,593,385)  
Prepaid expenses (1,185,759)       (1,054,110)       (1,185,759) (1,054,110)  
Gross deferred tax liabilities (50,238,358)       (16,942,375)       (50,238,358) (16,942,375)  
Deferred Tax Liabilities, Other (2,254,822)       (668,648)       (2,254,822) (668,648)  
Net deferred tax assets 23,257,985       23,830,899       23,257,985 23,830,899  
Reconciliation of the beginning and ending amount of unrecognized tax benefits [Roll Forward]                      
Unrecognized tax benefits balance at beginning of period       $ 4,043,623       $ 6,946,229 4,043,623 6,946,229 7,264,966
Gross increases for tax positions of current year                 246,725 54,025 166,375
Gross increases for tax positions of prior years                 786,674   8,228
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions                   (138,405)  
Federal and state tax settlements                 0 1,356,714 0
Lapse of statute of limitations                 (725,211) (1,461,512) (493,340)
Unrecognized tax benefits balance at end of period 4,351,811       4,043,623       4,351,811 4,043,623 6,946,229
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 1,400,000       1,800,000       $ 1,400,000 1,800,000 1,900,000
Current Fiscal Year End Date                 --03-31    
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount                 $ (500,000) (3,704,580) 0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount                 4,562,830 2,210 4,387
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount                 1,305,975 37,457 0
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount                 (672,358) 106,075 (130,606)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount                 (612,987) (287,703) (11,435)
Deferred Tax Liabilities, Leasing Arrangements (25,045,690)       0       (25,045,690) 0  
Deferred Tax Assets, Capital Loss Carryforwards 7,784,059       7,856,176       7,784,059 7,856,176  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent 25,309,841       $ 0       $ 25,309,841 $ 0  
U.S. federal income tax rate (in hundredths)                 21.00% 31.55%  
Discontinued Operations, Disposed of by Sale [Member]                      
Income tax expense reconciliation to U.S. federal tax rate [Abstract]                      
Expected income tax                 $ 0 $ 491,783 1,373,566
Discontinued Operation, Tax Effect of Discontinued Operation                 0 187,974 5,483
Increase (reduction) in income taxes resulting from:                      
Other, net                 0 (53,174) (1,622,370)
Income taxes                 0 626,583 (243,321)
Continuing Operations [Member]                      
Current Income Tax Expense (Benefit) [Abstract]                      
U.S. Federal                 3,307,872 20,508,247 32,398,898
State and local                 2,871,179 (871,439) 3,191,525
Current income tax expense                 6,179,051 19,636,808 35,590,423
Deferred Income Tax Expense (Benefit) [Abstract]                      
U.S. Federal                 (224,604) (1,833,943) 12,073,220
State and local                 797,518 (1,821,808) 94,165
Deferred income tax benefit                 572,914 (3,655,751) 12,167,385
Income Tax Expense (Benefit) [Abstract]                      
U.S. Federal                 3,083,268 18,674,304 44,472,118
State and local                 3,668,697 (2,693,247) 3,285,690
Increase (reduction) in income taxes resulting from:                      
Income taxes                 6,751,965 15,981,057 47,757,808
MEXICO                      
Investments, Owned, Federal Income Tax Note [Line Items]                      
TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit                 0 $ 0 $ 4,854,640
Domestic Tax Authority [Member]                      
Investments, Owned, Federal Income Tax Note [Line Items]                      
Operating Loss Carryforwards $ 9.9               $ 9.9