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Note 17 - Commitments and Contingencies (Details Textual) - USD ($)
12 Months Ended
Apr. 07, 2017
Dec. 31, 2017
Dec. 31, 2016
Operating Leases, Rent Expense, Net   $ 1,427,000 $ 2,392,000
Purchase Obligation   3,296,000  
Accrual for Environmental Loss Contingencies   0 0
Inventory, Net   17,641,000 14,558,000
Tampa Facility Litigation [Member]      
Cost of Property Repairs and Maintenance   52,000  
Litigation Settlement, Expense $ 448,000    
Customer Lawsuit Against Distributor [Member] | Inventory Related to Customer Involved in Lawsuit Against Distributor [Member]      
Inventory, Net   $ 1,034,000  
Accrued Liabilities [Member] | Tampa Facility Litigation [Member]      
Loss Contingency Accrual     $ 500,000