Consolidated Balance Sheets (Parentheticals) - $ / shares $ / shares in Thousands	Dec. 31, 2019	Dec. 31, 2018
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares outstanding (in shares)	0	0
Common Class A [Member]
Class of common stock, par value (in dollars per share)	$ 0	$ 0
Class of common stock, shares authorized (in shares)	10,000,000	10,000,000
Class of common stock, shares issued (in shares)	2,553,503	2,161,014
Treasury shares, issued (in shares)	37,208	37,208
Common Class B [Member]
Class of common stock, par value (in dollars per share)	$ 0	$ 0
Class of common stock, shares authorized (in shares)	2,500,000	2,500,000
Class of common stock, shares issued (in shares)	954.283	779,283
Treasury shares, issued (in shares)	182,435	182,435