Note 11 - Stockholders' Equity (Detail) - A summary of stock option transactions: (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Weighted-average fair value of options granted during year	$ 0.83	$ 1.19	$ 1.42
Granted (in Shares)	12,000	12,000
Granted	$ 5.27	$ 4.80
Exercised (in Shares)	(6,000)
Exercised	$ 3.50
Director 2007 Non-Qualified Stock Option Plan [Member] | Year 2012 [Member]
Option Shares (in Shares)	115,600
Weighted Average Exercise Price	$ 4.40
Exercisable at end of year (in Shares)	121,600
Exercisable at end of year	$ 4.53
Weighted-average fair value of options granted during year	$ 0.83
Granted (in Shares)	12,000
Granted	$ 5.27
Exercised (in Shares)	(6,000)
Exercised	$ 3.50
Option Shares (in Shares)	121,600
Weighted Average Exercise Price	$ 4.53
Director 2007 Non-Qualified Stock Option Plan [Member] | Year 2011 [Member]
Option Shares (in Shares)		103,600
Weighted Average Exercise Price		$ 4.35
Exercisable at end of year (in Shares)		115,600
Exercisable at end of year		$ 4.40
Weighted-average fair value of options granted during year		$ 1.19
Granted (in Shares)		12,000
Granted		$ 4.80
Option Shares (in Shares)		115,600
Weighted Average Exercise Price		$ 4.40
Director 2007 Non-Qualified Stock Option Plan [Member] | Year 2010 [Member]
Option Shares (in Shares)			197,700
Weighted Average Exercise Price			$ 2.23
Exercisable at end of year (in Shares)			70,000
Exercisable at end of year			$ 4.33
Weighted-average fair value of options granted during year			$ 1.42
Granted (in Shares)			42,600
Granted			$ 4.59
Exercised (in Shares)			(136,700)
Exercised			$ 1.65
Option Shares (in Shares)			103,600
Weighted Average Exercise Price			$ 4.35