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Note 5 - Debt (Details Textual)
 6 Months Ended
Jun. 30, 2016
USD ($)
Line Of Credit Facility [Line Items]  
Percentage of Stock of Material First Tier Foreign Subsidiaries Securing Credit Agreement 65.00%
UNITED STATES  
Line Of Credit Facility [Line Items]  
Percentage of Stock of Material Domestic Subsidiaries Securing Credit Agreement 100.00%
Prior Credit Agreement [Member]  
Line Of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity $ 200,000,000
Amended Credit Agreement [Member]  
Line Of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity 150,000,000
Long-term Line of Credit 117,000,000
Line of Credit Facility, Remaining Borrowing Capacity $ 30,000,000
Fixed Charged Coverage Ratio Required 1.00
Excess Availability Below Which the Fixed Charge Coverage Ratio is Triggered 12.50%
Excess Availability Percentage of Lender Commitments Threshold Triggering Cash Dominion Control 12.50%
Lender Commitments, Threshold Trigger, Excess Availability Amount $ 18,750,000
Amended Credit Agreement [Member] | Restricted Cash [Member]  
Line Of Credit Facility [Line Items]  
Eligible Cash 23,000,000
Amended Credit Agreement [Member] | Letter of Credit [Member]  
Line Of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity $ 150,000,000
Amended Credit Agreement [Member] | Period one [Member]  
Line Of Credit Facility [Line Items]  
Line of Credit Facility, Expiration Date May 26, 2021
Amended Credit Agreement [Member] | Period two [Member]  
Line Of Credit Facility [Line Items]  
Number of days prior to the earliest scheduled maturity date 90 days
Earliest maturity date Sep. 03, 2019
ABL Credit Facility [Member]  
Line Of Credit Facility [Line Items]  
Excess Availability, Calculation, Percentage of Eligible Receivables Less a Dilution Reserve 85.00%
Excess Availability, Calculation, Percentage of Net Orderly Liquidation Value 85.00%
Excess Availability, Calculation, Percentage of Eligible Inventory 75.00%
Excess Availability, Net Orderly Liquidation Equipment Amount $ 20,000,000
Excess Availability, Calculation, Percentage of Eligible Equipment 75.00%
ABL Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Line Of Credit Facility [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 2.25%
ABL Credit Facility [Member] | Minimum [Member] | Base Rate [Member]  
Line Of Credit Facility [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 1.25%
ABL Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Line Of Credit Facility [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 2.75%
ABL Credit Facility [Member] | Maximum [Member] | Base Rate [Member]  
Line Of Credit Facility [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 1.75%