Note 10 - New Accounting Pronouncements (Details Textual)	12 Months Ended
Dec. 31, 2017 USD ($)
New Accounting Pronouncement, Early Adoption, Effect [Member] \| Accounting Standards Update 2018-02 [Member]
Reclassifications of Amounts Within AOCI to Retained Earnings Due to Tax Reform	$ 31,818

Represents the amounts within accumulated other comprehensive income reclassified to retained earnings during the period as a result of tax reform.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration