Note 16 - Employee Benefit Plan (Details Textual) - Defined Contribution Plan, 401 K [Member] - Pension Plan [Member] - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay			100.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 237,000	$ 89,000	$ 587,000	$ 268,000