Note 14 - Commitments and Contingencies (Details Textual) - USD ($)	3 Months Ended
Mar. 31, 2019	Apr. 01, 2018	Dec. 31, 2018
Standard and Extended Product Warranty Accrual, Ending Balance	$ 572,000		$ 582,000
Accrual for Environmental Loss Contingencies, Ending Balance	0		0
Inventory, Net, Total	21,109,000		18,584,000
Revenue from Contract with Customer, Including Assessed Tax	19,564,000	$ 19,942,000
Inventory Valuation Reserves, Ending Balance	1,421,000		$ 1,414,000
Selling, General and Administrative Expenses [Member]
Gain (Loss) Related to Litigation Settlement, Total	9,831,000
New Supply Agreement [Member]
Revenue from Contract with Customer, Including Assessed Tax	293,000
Inventory Valuation Reserves, Ending Balance	246,000
New Supply Agreement [Member] \| Forecast [Member]
Increase (Decrease), Inventory Valuation Reserves	500,000
Customer Lawsuit Against Distributor [Member] \| Inventory Related to Customer Involved in Lawsuit Against Distributor [Member]
Inventory, Net, Total	$ 746,000

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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