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Note 7 - Line of Credit (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 26, 2015
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Line of Credit Facility, Maximum Borrowing Capacity $ 60,000        
Interest Expense, Debt   $ 400 $ 500 $ 1,400 $ 2,300
Interest Costs Capitalized     0 100 $ 200
2015 Credit Agreement [Member]          
Line of Credit Facility, Maximum Borrowing Capacity     13,000    
Long-term Line of Credit   $ 0 $ 0 $ 0  
2015 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.75%        
2015 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]          
Debt Instrument, Basis Spread on Variable Rate 2.25%        
2015 Credit Agreement [Member] | Prime Rate [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate 0.75%        
2015 Credit Agreement [Member] | Prime Rate [Member] | Maximum [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.25%