Note 3 - Note Receivable (Details Textual) - C2Go [Member] - USD ($)	Feb. 02, 2016	Dec. 31, 2020
Financing Receivable, after Allowance for Credit Loss, Total	$ 200,000
Notes Receivable, Stated Interest Rate	10.00%
Notes Receivable, Term (Month)	1 year 180 days
Financing Receivable, before Allowance for Credit Loss, Total		$ 145,000
Financing Receivable, Allowance for Credit Loss, Ending Balance		$ 145,000

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant