Note 16 - Common Stock Offering (Details Textual) - USD ($)			12 Months Ended
	Mar. 07, 2014	Jan. 30, 2009	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Proceeds from Issuance of Common Stock	$ 15,800,000				$ 15,814,312
Treasury Stock, Shares			2,465,476	2,466,462
Series A Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues		17,000
Treasury Stock, Shares	12,000
Underwritten Offering [Member]
Proceeds from Issuance of Common Stock	$ 17,200,000
Underwritten Offering [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues	1,499,999
Over-Allotment Option [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues	195,652
Share Price	$ 11.50