Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Note 11 - Share-based Compensation (Details Textual) - USD ($) $ / shares in Units, Pure in Thousands, $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	May 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)				3,678,883		3,678,883		3,931,586
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)				$ 5.30		$ 5.30		$ 4.41
Share-based Payment Arrangement, Expense				$ 1,303	$ 546	$ 4,310	$ 1,562
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate						0.00%	0.00%
The 2017 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)	7,500,000	6,000,000							2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)	1,500,000	1,900,000	2,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)				1,667,338		1,667,338
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount				$ 4,300		$ 4,300
The 2017 Stock Incentive Plan [Member] \| Performance-based Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)								100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)								$ 5.46
Share-based Payment Arrangement, Expense						$ 0		$ 0
The 2017 Stock Incentive Plan [Member] \| Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate						0.00%
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)						2 years 3 months 18 days
The 2017 Stock Incentive Plan [Member] \| Share-based Payment Arrangement, Option [Member] \| Employees, Directors and Consultants [Member]
Share-based Payment Arrangement, Expense				836	319	$ 2,065	$ 599
The 2017 Stock Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Expense				467	$ 227	$ 2,245	$ 963
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)						2 years 1 month 6 days
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount				$ 1,718		$ 1,718