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Note 8 - Supplementary Income Statement Information (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Taxes, Other	$ 154,167	$ 145,245

X

- Definition

Amount of tax expense classified as other.

+ References

No definition available.

+ Details

Name:	us-gaap_TaxesOther
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration