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Note 2 - Significant Accounting Policies (Detail) - Summary of stock option activity under stock option plans: (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 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) $ 3.50  
# of shares (6,000)  
Weighted Average Exercise Price (in Dollars per share) $ 4.53 $ 4.40
# of shares 121,600 115,600
Weighted Average Remaining Contractual Term (in years) 4 years 302 days 5 years 54 days
Aggregate Intrinsic Value (in Dollars) $ 206,760 $ 206,332
Weighted Average Exercise Price (in Dollars per share) $ 4.53 $ 4.40
# of shares 121,600 115,600
Weighted Average Remaining Contractual Term (in years) 4 years 302 days 5 years 54 days
Aggregate Intrinsic Value (in Dollars) $ 206,760 $ 206,332