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Note 14 - Commitments and Contingencies (Details Textual) - USD ($)
Apr. 01, 2018
Jan. 01, 2018
Dec. 31, 2017
Standard and Extended Product Warranty Accrual, Ending Balance $ 607,000   $ 666,000
Inventory, Net, Total 16,579,000 $ 16,986,000 $ 17,641,000
Purchase Obligation, Total 9,543,000    
Customer Lawsuit Against Distributor [Member] | Inventory Related to Customer Involved in Lawsuit Against Distributor [Member]      
Inventory, Net, Total $ 1,036,000