Note 4 - Share Repurchase Plan (Details Textual) - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Share Repurchase Program 1 [Member]
Treasury Stock, Shares, Acquired	0	0
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		100,000
Treasury Stock, Shares	57,883
Treasury Stock Shares Average Price Per Share Acquired	$ 16.97
Treasury Stock, Value	$ 982,000
Treasury Stock, Shares	164,569		164,569
Treasury Stock, Value	$ 2,476,000		$ 2,476,000