Note 18 - Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent		75.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 26,000	$ 0

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration