Note 11 - Debt (Details Textual)	Dec. 31, 2019 USD ($)
Long-term Debt, Current Maturities, Total	$ 286,700
Long-term Debt, Excluding Current Maturities, Total	33,740
Collateral Pledged [Member] \| Loan with Ministry of Science and Innovation, Due February 2, 2024 [Member] \| Genasys Acquisition [Member] \| Loans With Governmental Agencies [Member]
Long-term Debt, Current Maturities, Total	$ 269,830

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LongTermDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant