CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Common Stock, Value	$ 1,427	$ 1,412
Common Class A [Member]
Class of Stock [Line Items]
Common Stock, Value	1,387	1,372
Common Class B [Member]
Class of Stock [Line Items]
Common Stock, Value	40	40
Common Class C Member
Class of Stock [Line Items]
Common Stock, Value	$ 0	$ 0