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Note 5 - Earnings Per Share (Detail) - The following table sets forth the computation of basic and diluted earnings per share: (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Numerator:        
Net income (in Dollars) $ 1,539,638 $ 1,076,356 $ 3,113,744 $ 2,226,932
Numerator for basic and diluted earnings per share (in Dollars) $ 1,539,638 $ 1,076,356 $ 3,113,744 $ 2,226,932
Denominator:        
Weighted-average shares outstanding-basic 10,156,442 10,156,442 10,156,442 10,156,442
Effect of dilutive securities:        
Effect of dilutive securities 15,729 11,656 16,119 19,119
Denominator for diluted earnings per share-weighted-average shares 10,172,171 10,168,098 10,172,561 10,175,561
Basic earnings per share (in Dollars per share) $ 0.15 $ 0.11 $ 0.30 $ 0.22
Diluted earnings per share (in Dollars per share) $ 0.15 $ 0.11 $ 0.30 $ 0.22
Stock Options [Member]
        
Effect of dilutive securities:        
Effect of dilutive securities 15,729 11,656 16,119 19,119