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Note 3 - Certificates of Deposit
 9 Months Ended
Sep. 30, 2018
Notes to Financial Statements  
Certificates Of Deposit Disclosure[Text Block]
Note
3
:     
Certificates of Deposit
 
The Company has certificates of deposit for investment purposes. Certificates of deposit have maturities greater than 
three
 months when purchased, in amounts 
not
 greater than 
$250,000.
 All certificates of deposit are held until maturity and recorded at cost which approximates fair value. Certificates of deposit mature through 
August
of
2020.
Certificates of deposit were
$2,150,000
and
$2,662,890
as of
September 30, 2018
and
December 31, 2017,
respectively. Purchases of certificates of deposit were
$3,145,000
and
$2,412,890
for the
nine
months ended
September 30, 2018
and
2017,
respectively. Proceeds from the maturity of certificates of deposit were
$2,662,890
and
$2,410,000
for the
nine
months ended
September 30, 2018
and
2017,
respectively.