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Note 7 - Equity Incentive Plans (Details Textual) - USD ($)	1 Months Ended	6 Months Ended
	Nov. 30, 2014	Jun. 30, 2020	Jun. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total		$ 4,574,762	$ 2,741,009
NASDAQ Marketplace Rules Inducement Award [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		4 years
NASDAQ Marketplace Rules Inducement Award [Member] \| Executive Vice President of Finance [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		3 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in shares)		1,322,678
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in dollars per share)		$ 19.16
Stock Plan 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)		112,085
Stock Plan 2010 [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		2 years
Stock Plan 2010 [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		4 years
Omnibus Incentive Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	2,645,744	1,351,141
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)	3,979,200
Omnibus Incentive Plan 2014 [Member] \| Restricted Stock Units (RSUs) [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Omnibus Incentive Plan 2014 [Member] \| Restricted Stock Units (RSUs) [Member] \| Non-employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	1 year