Annual report pursuant to Section 13 and 15(d)

Note 16 - Subsequent Events (Details Textual)

v3.19.1
Note 16 - Subsequent Events (Details Textual) - USD ($)
 2 Months Ended 3 Months Ended 12 Months Ended
Mar. 11, 2019
Mar. 31, 2019
Dec. 31, 2017
ATM Offering [Member]      
Stock Issued During Period, Shares, New Issues     10,952,093
Proceeds from Issuance of Common Stock     $ 13,900,000
Common Share Purchase Agreement [Member] | Scenario, Forecast [Member]      
Stock Issued During Period, Shares, New Issues   3,259,955  
Proceeds from Issuance of Common Stock   $ 6,000,000  
Subsequent Event [Member] | ATM Offering [Member]      
Stock Issued During Period, Shares, New Issues 77,349    
Proceeds from Issuance of Common Stock $ 183,000