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Note 6 - Pension and Retirement Plans (Detail) - Components of net periodic benefit costs (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Foreign [Member] | Pension [Member]
        
Pension:        
Service cost $ 15 $ 15 $ 30 $ 32
Interest cost 173 178 346 357
Expected return on plan assets (104) (104) (208) (209)
Amortization of net gain 36 22 72 44
Net periodic benefit cost 120 111 240 224
US [Member] | Pension [Member]
        
Pension:        
Service cost   3   5
Interest cost 16 20 32 42
Amortization of net gain 6 8 12 15
Net periodic benefit cost 22 31 44 62
US [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
        
Pension:        
Interest cost 9 18 18 36
Amortization of net gain (46) 17 (92) 35
Net periodic benefit cost (37) 35 (74) 71
Pension [Member]
        
Pension:        
Service cost 15 18 30 37
Interest cost 189 198 378 399
Expected return on plan assets (104) (104) (208) (209)
Amortization of net gain 42 30 84 59
Net periodic benefit cost 142 142 284 286
Other Postretirement Benefit Plans, Defined Benefit [Member]
        
Pension:        
Interest cost 9 18 18 36
Amortization of net gain (46) 17 (92) 35
Net periodic benefit cost $ (37) $ 35 $ (74) $ 71