Note 1 - Basis of Presentation (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 shares	Jun. 30, 2019 shares	Jun. 30, 2020 USD ($) shares
Number of Entities Consolidated as Variable Interest Entities	3		3
Deconsolidation, Gain (Loss), Amount | $			$ 219,000
Convertible Preferred Stock, Shares to be Issued Upon Conversion (in shares)	5,908,600		5,908,600
Number of Shares Issuable Upon the Exercise of Options and Warrants (in shares)	792,660	471,144	792,660
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	0	0