Note 11 - Contract Balances	9 Months Ended
Sep. 30, 2019
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	11. Contract Balances In certain cases, the Company’s customers pay for their goods in advance. These prepayments are recognized as customer deposits (contract liabilities) and recorded in other accrued liabilities in the condensed consolidated balance sheets. The balance of customer deposits was $7,814 and $14,174 at September 30, 2019 and December 31, 2018, respectively. During the nine months ended September 30, 2019, the Company recognized revenue of $9,166 related to amounts included in the December 31, 2018 customer deposit balance. The Company typically recognizes revenue within one year of the receipt of the customer deposit.

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Name:	us-gaap_RevenueFromContractWithCustomerTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration