Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Equity Instruments (Details Textual)

v3.10.0.1
Note 12 - Equity Instruments (Details Textual) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Stock Issued During Period, Shares, Employee Benefit Plan 94,684 105,308
Issuance of Stock to Defined Contribution Plan for Employer Matching Contribution $ 35,980 $ 53,707
Common Stock [Member]    
Stock Issued During Period, Shares, Employee Benefit Plan 94,684  
Employees [Member] | Common Stock [Member]    
Stock Issued During Period, Shares, Issued for Services 1,118,760 710,353
Stock Issued During Period, Value, Issued for Services $ 317,000 $ 369,000
Director [Member] | Common Stock [Member]    
Stock Issued During Period, Shares, Issued for Services 0 16,406
Stock Issued During Period, Value, Issued for Services   $ 10,500