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v3.19.1

Note 12 - Concentration of Credit Risk (Details Textual) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Cash, Uninsured Amount | $ 10,052,914 | $ 6,967,469

X
- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
Name: | us-gaap_CashUninsuredAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant