Note 15 - Employee Benefit Plan (Details Textual) - Defined Contribution Plan, 401 K [Member] - Pension Plan [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay			100.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 95,000	$ 38,000	$ 179,000	$ 88,000