Note 18 - Employee Benefit Plans (Detail) (USD $)	12 Months Ended					3 Months Ended		12 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2012 Minimum [Member]	Mar. 31, 2010 First Five Percent of Eligible Compensation [Member]	Mar. 31, 2010 Matched at 100% [Member]	Dec. 31, 2012 Matched at 100% [Member]	Mar. 31, 2010 Less Than Two Years of Service [Member]	Mar. 31, 2010 Yearly After Two Years of Service [Member]	Dec. 31, 2012 First Two and Half Percent of Eligible Compensation [Member]
Minimum Number Of Years Allowed To Participate In Employee Stock Ownership Plan	2 years
Minimum number of hours allowed to participate in employee stock ownership plan for part-time employees	1000 years
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares)	2,814	3,437	4,881
Stock Issued During Period, Value, Employee Stock Purchase Plan (in Dollars)	$ 47,000	$ 47,000	$ 51,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	116,124	83,020	171,689
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)		1,188,741
Percentage Of Outstanding Common Stock Under Employee Stock Ownership Plan		1.50%
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	75.00%						5.00%	2.50%
Defined Contribution Plan, Employer Matching Contribution, Percent						100.00%					100.00%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage									0.00%	25.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount (in Dollars)	1,000,000	900,000	900,000
Percentage of Participant Borrowing Capacity of Vested Amount	50.00%
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Employer Cash Payments Used for Debt Service (in Dollars)				$ 50,000	$ 1,000