Consolidated Balance Sheets (Parentheticals) - $ / shares $ / shares in Thousands	Dec. 31, 2019	Dec. 31, 2018
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, authorized (in shares)	5,000,000	5,000,000
Preferred stock, issued (in shares)	0	0
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, authorized (in shares)	50,000,000	50,000,000
Common stock, issued (in shares)	1,925,025	2,030,017
Common stock, outstanding (in shares)	1,925,025	2,030,017