Note 3 - Stock-Based Compensation (Details) - Summary of stock option activity: (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Summary of stock option activity: [Abstract]
Weighted Average Exercise Price (in Dollars per share)	$ 4.53	$ 4.40
# of shares	121,600	115,600
Weighted Average Exercise Price (in Dollars per share)	$ 6.87	$ 5.27
# of shares	12,000	12,000
Weighted Average Exercise Price (in Dollars per share)	$ 4.24
# of shares	(22,000)
Weighted Average Exercise Price (in Dollars per share)	$ 4.84	$ 4.48
# of shares	111,600	127,600
Weighted Average Remaining Contractual Term (in years)	5 years 262 days	5 years 47 days
Aggregate Intrinsic Value (in Dollars)	$ 167,186	$ 216,332
Weighted Average Exercise Price (in Dollars per share)	$ 4.60	$ 4.40
# of shares	99,600	115,600
Weighted Average Remaining Contractual Term (in years)	5 years 87 days	4 years 251 days
Aggregate Intrinsic Value (in Dollars)	$ 155,500	$ 206,332