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Note 11 - Business Acquisition - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Jul. 01, 2019
Goodwill $ 164,774,000 $ 164,774,000  
Asset Purchase Agreement [Member]      
Cash and cash equivalents     $ 56,000
Accounts receivable     7,835,000
Prepaid expenses and other current assets     54,000
Property and equipment     138,000
Intangible assets     4,700,000
Goodwill     4,983,000
Other non-current assets     28,000
Accounts payable     7,691,000
Accrued expenses and other current liabilities     418,000
Deferred revenue     33,000
Total net assets acquired     $ 9,652,000