Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands	Mar. 31, 2020	Dec. 31, 2019
Deferred tax assets, valuation allowance	$ 5,928,000	$ 6,580,000
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, authorized (in shares)	250,000,000	250,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	67,022,568	67,022,568
Common stock, shares outstanding (in shares)	67,022,568	67,022,568