Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares $ / shares in Thousands	Sep. 30, 2019	Dec. 31, 2018
Common Class A [Member]
Common shares, par value (in dollars per share)	$ 0	$ 0
Common shares, authorized (in shares)	10,000,000	10,000,000
Common shares, issued (in shares)	2,162,806	2,161,014
Common shares, outstanding (in shares)	2,162,806	2,161,014
Treasury shares, issued (in shares)	37,208	37,208
Common Class B [Member]
Common shares, par value (in dollars per share)	$ 0	$ 0
Common shares, authorized (in shares)	2,500,000	2,500,000
Common shares, issued (in shares)	696,848	696,848
Common shares, outstanding (in shares)	696,848	696,848
Treasury shares, issued (in shares)	182,435	182,435