Note 14 - Employee Benefit Plans (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Sep. 30, 2017
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 17,545	$ 2,532	$ 183,996	$ 39,249

Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

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