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Note 15 - Commitments and Contingencies (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Sep. 30, 2018
Oct. 01, 2017
Jan. 01, 2018
Dec. 31, 2017
Standard and Extended Product Warranty Accrual, Ending Balance $ 570,000   $ 570,000 $ 570,000     $ 666,000
Inventory, Net, Total 18,856,000   18,856,000 18,856,000   $ 16,986,000 $ 17,641,000
Revenue from Contract with Customer, Including Assessed Tax 21,101,000 $ 21,371,000 64,014,000   $ 60,805,000    
Purchase Obligation, Total 15,417,000   15,417,000 15,417,000      
Customer Defaulted [Member] | Minimum [Member]              
Loss Contingency, Estimate of Possible Loss 0   0 0      
New Supply Agreement [Member]              
Revenue from Contract with Customer, Including Assessed Tax       68,000      
Customer Lawsuit Against Distributor [Member] | Inventory Related to Customer Involved in Lawsuit Against Distributor [Member]              
Inventory, Net, Total $ 969,000   $ 969,000 $ 969,000