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Note 4 - Stock-Based Compensation (Detail) - Summary of stock option activity: (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Weighted Average Exercise Price (in Dollars per share) $ 4.40 $ 4.35
# of shares 115,600 103,600
Weighted Average Exercise Price (in Dollars per share) $ 5.27 $ 4.80
# of shares 12,000 12,000
Weighted Average Exercise Price (in Dollars per share) $ 2.72  
# of shares (2,000)  
Weighted Average Exercise Price (in Dollars per share) $ 4.51 $ 4.40
# of shares 125,600 115,600
Weighted Average Remaining Contractual Term (in years) 4 years 339 days 5 years 146 days
Aggregate Intrinsic Value (in Dollars) $ 213,256 $ 206,332
Weighted Average Exercise Price (in Dollars per share) $ 4.51 $ 4.40
# of shares 125,600 115,600
Weighted Average Remaining Contractual Term (in years) 4 years 339 days 5 years 146 days
Aggregate Intrinsic Value (in Dollars) $ 213,256 $ 206,332