Note 14 - Commitments and Contingencies (Details Textual) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Contractual Obligation	$ 25,438,208	$ 18,039,244
Unfunded Commitments Under Lines Of Credit [Member]
Contractual Obligation	$ 16,667,928	$ 11,310,327

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

No definition available.

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