Note 15 - Employee Benefit Plan (Details Textual) - Defined Contribution Plan, 401 K [Member] - Pension Plan [Member] - USD ($)	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	100.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 84,000	$ 50,000

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