Note 14 - Stockholders' Equity (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jan. 08, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Feb. 11, 2015	Jan. 07, 2015	Dec. 31, 2014	Mar. 05, 2014
Note 14 - Stockholders' Equity (Details) [Line Items]
Stock Repurchased and Retired During Period, Shares			0
Stock Repurchased and Retired During Period, Value		$ 489,536		$ 8,201,681
Common Stock, Shares, Issued		11,083,976		11,083,976			11,135,825	11,329,732
Common Stock, Shares, Outstanding		11,083,976		11,083,976			11,135,825	11,329,732
Dutch Auction Tender Offer [Member]
Note 14 - Stockholders' Equity (Details) [Line Items]
Stock Repurchased and Retired During Period, Shares	193,907
Treasury Stock Acquired, Average Cost Per Share	$ 18.50
Stock Repurchased and Retired During Period, Value	$ 3,587,280
Stock Repurchased Transaction Costs	$ 70,000
Stock Buyback Program 2015 [Member]
Note 14 - Stockholders' Equity (Details) [Line Items]
Stock Repurchased and Retired During Period, Shares		25,413		239,502
Stock Repurchased and Retired During Period, Value		$ 489,536		$ 4,544,592
Stock Repurchase Program, Authorized Amount						$ 20,000,000
Stock Buyback Program 2014 [Member]
Note 14 - Stockholders' Equity (Details) [Line Items]
Stock Repurchased and Retired During Period, Shares					6,092
Stock Repurchased and Retired During Period, Value					$ 82,286
Stock Repurchase Program, Authorized Amount									$ 20,000,000