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Note 1 - Basis of Presentation (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Increase (Decrease) in Income Taxes Receivable $ (807,000) $ (604,000)
Increase (Decrease) in Accrued Liabilities (614,000) (2,322,000)
Increase (Decrease) in Accounts Payable 1,513,000 (323,000)
Payments to Acquire Property, Plant, and Equipment $ 1,463,000 1,497,000
Restatement Adjustment [Member]    
Increase (Decrease) in Income Taxes Receivable   315,000
Increase (Decrease) in Accrued Liabilities   (315,000)
Increase (Decrease) in Accounts Payable   (105,000)
Payments to Acquire Property, Plant, and Equipment   $ (105,000)