Note 9 - Benefit Plans (Detail) - Defined Benefit Plans Information (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Benefit obligation	$ 23,897,000	$ 20,277,000
Changes in plan assets
Fair value of plan assets	15,811,000	16,742,000
Funded status at end of year	(10,468,000)	(8,086,000)
Actual return on assets	2,155,000	(235,000)
Employer contributions	550,000	550,000
Fair value of plan assets	17,351,000	15,811,000
Amounts recognized in consolidated balance sheet
Long-term pension liability	(10,468,000)	(8,086,000)
income consist of:
Net actuarial loss	12,223,000	10,597,000
Prior service cost	13,000	30,000
	12,236,000	10,627,000
Service cost	595,000	559,000
Interest cost	1,023,000	1,092,000
Actuarial loss	3,469,000	3,215,000
Benefits paid	(1,165,000)	(1,246,000)
Benefit obligation	$ 27,819,000	$ 23,897,000