Note 13 - Stock Plans (Detail) (USD $)	3 Months Ended	12 Months Ended					12 Months Ended		8 Months Ended	12 Months Ended	0 Months Ended		1 Months Ended
	Sep. 30, 2008	Dec. 31, 2012	Dec. 31, 2011	Apr. 30, 2013	Feb. 02, 2013	Apr. 30, 2012	Dec. 31, 2012 Scenario, Forecast [Member] Equity Incentive Plan [Member]	Dec. 31, 2012 Equity Incentive Plan [Member]	Aug. 31, 2009 2003 Restricted Stock Award [Member]	Dec. 31, 2011 2003 Restricted Stock Award [Member]	Feb. 15, 2013 Restricted Stock [Member] Chief Executive Officer [Member]	Feb. 02, 2013 Restricted Stock [Member]	Feb. 19, 2013 Non-Qualified Stock Option [Member] Chief Executive Officer [Member]	Dec. 30, 2012 Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized								1,100,000	150,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized							25,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant								665,860
Share Price (in Dollars per share)														$ 13.23
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars)		$ 0	$ 7,424
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)		$ 2.43	$ 2.99
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period								25,925	100,000	0
Restricted Common Stock, Shares, Grants in Period	200,000
Restricted Common Stock Grant Date Value (in Dollars per share)	$ 12.13				$ 4.98								$ 4.83
Forfeited Shares				2,000		2,000
Stock Issued During Period, Shares, Share-based Compensation, Gross											75,000	36,961	42,910