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Note 1 - Nature of Operations, Organization and Significant Accounting Policies (Tables)
 12 Months Ended
Apr. 30, 2017
Notes Tables  
Schedule of Other Assets [Table Text Block]
(dollars in thousands)
 
2017
 
 
2016
 
 
 
 
 
 
 
 
 
 
Privilege fee
 
$
5,500
 
 
$
5,500
 
Less amortized costs
 
 
 
2,256
 
 
 
1,833
 
Privilege fee balance
 
$
3,244
 
 
$
3,667
 
 
 
 
 
 
 
 
 
 
Intangible gaming equipment
 
$
5,012
 
 
$
4,576
 
Less amortized costs
 
 
 
3,782
 
 
 
2,974
 
Intangible gaming equipment balance
 
$
1,230
 
 
$
1,602
 
 
 
 
 
 
 
 
 
 
JET autopilot intellectual property
 
$
1,417
 
 
$
1,417
 
Less amortized costs
 
 
 
866
 
 
 
772
 
JET autopilot balance
 
$
551
 
 
$
645
 
Supplemental Type Certificates Capitalized Costs [Table Text Block]
(dollars in thousands)
 
2017
 
 
2016
 
 
 
 
 
 
 
 
 
 
Direct labor
 
$
2,199
 
 
$
2,044
 
Direct materials
 
 
 
2,866
 
 
 
2,638
 
Consultant costs
 
 
 
1,922
 
 
 
1,922
 
Overhead
 
 
 
3,712
 
 
 
3,426
 
 
 
 
 
10,699
 
 
 
10,030
 
Less-amortized costs
 
 
 
4,345
 
 
 
3,549
 
STC balance
 
$
6,354
 
 
$
6,481
 
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
(in thousands, except per share data)
 
2017
 
 
2016
 
 
 
 
 
 
 
 
 
 
Net income attributable to Butler National Corporation
 
$
1,534
 
 
$
24
 
Weighted average common shares outstanding
 
 
 
63,455,883
 
 
 
62,263,404
 
Dilutive effect of non-qualified stock option plans
 
 
 
-
 
 
 
-
 
Weighted average common shares outstanding, assuming dilution
 
 
 
63,455,883
 
 
 
62,263,404
 
Potential common shares if all options were exercised and shares issued
 
 
 
63,455,883
 
 
 
62,263,404
 
Basic earnings per common share
 
$
0.02
 
 
$
0.00
 
Diluted earnings per common share
 
$
0.02
 
 
$
0.00