Note 9 - Benefit Plans (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plans, Number of Plans	2
Defined Benefit Plans, Retirement Age	65 years
Defined Benefit Plan, Funded Status of Plan	$ (10,468,000)	$ (8,086,000)
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	1,000,000
Defined Contribution Plan, Employer Matching Contribution, Percent	25.00%
Pension Contributions	120,000	112,000
Actuarial Loss [Member]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	1,146,000
Prior Service [Member]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	$ 13,000