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Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Balance Beginning of Year $ 1,277,742 $ 2,083,567
Charges to Costs and Expenses 586,291 152,337
Deductions [1] (642,040) (958,162)
Balance End of Year 1,221,993 1,277,742
SEC Schedule, 12-09, Reserve, Inventory [Member]    
Balance Beginning of Year 665,308 1,111,795
Charges to Costs and Expenses 266,021 127,293
Deductions [1] (207,380) (573,780)
Balance End of Year 723,949 665,308
SEC Schedule, 12-09, Allowance, Credit Loss [Member]    
Balance Beginning of Year 612,434 971,772
Charges to Costs and Expenses 320,270 25,044
Deductions [1] (434,660) (384,382)
Balance End of Year $ 498,044 $ 612,434
[1] Includes write-offs, the impact of foreign currency exchange rates.