Note 15 - Related Party Transactions (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts Receivable, Related Parties	$ 39,000	$ 0
China Pioneer [Member]
Revenue from Related Parties		27,000	$ 418,000
China Pioneer [Member] \| Selling and Marketing Expense [Member]
Related Party Costs	426,000	102,000	0
China Kingston [Member] \| Related-party Commission Fees [Member]
Related Party Transaction, Expenses from Transactions with Related Party	$ 400,000	$ 0	$ 1,100,000

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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Direct costs arising from transactions with related parties who are not affiliates or joint Ventures. These costs are categorized as cost of goods sold.

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