Note 1 - Organization and Significant Accounting Policies - Annual Depreciation Rates of Property, Plant and Equipment (Details)	Dec. 31, 2020
Minimum [Member] | Computers, Software and Equipment [Member]
Computers, software and equipment	10.00%
Minimum [Member] | Office Furniture and Equipment [Member]
Computers, software and equipment	7.00%
Minimum [Member] | Leasehold Improvements [Member]
Computers, software and equipment	10.00%
Maximum [Member] | Computers, Software and Equipment [Member]
Computers, software and equipment	33.00%
Maximum [Member] | Office Furniture and Equipment [Member]
Computers, software and equipment	33.00%
Maximum [Member] | Leasehold Improvements [Member]
Computers, software and equipment	20.00%