Consolidated Balance Sheets (Parentheticals) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts	$ 0	$ 0
Series A redeemable, par value (in dollars per share)	$ 0	$ 0
Series A redeemable, shares authorized (in shares)	500,000	500,000
Series A redeemable, shares issued (in shares)	0	0
Series A redeemable, shares outstanding (in shares)	0	0
Preferred shares, par value (in dollars per share)	$ 0	$ 0
Preferred shares, shares authorized (in shares)	1,500,000	1,500,000
Preferred shares, shares issued (in shares)	0	0
Preferred shares, shares outstanding (in shares)	0	0
Common shares, par value (in dollars per share)	$ 0	$ 0
Common shares, shares authorized (in shares)	30,000,000	30,000,000
Common shares, shares issued (in shares)	6,775,971	6,853,161
Common shares, shares outstanding (in shares)	6,775,971	6,853,161