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Note 2 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		As of
		June 30, 2020				December 31, 2019
Cash and cash equivalents		$	53,065,833			$	65,249,072
Restricted cash-short term			—				95,737,862
Cash, cash equivalents and restricted cash		$	53,065,833			$	160,986,934

		June 30, 2019				December 31, 2018
Cash and cash equivalents		$	100,263,915			$	100,652,809
Restricted cash-short term			11,248,400				11,452,078
Restricted cash-long term			64,480,624				68,292,023
Cash, cash equivalents and restricted cash		$	175,992,939			$	180,396,910

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