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Note 17 - Income Taxes (Tables)
12 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   
Year Ended March 31,
 
   
2017
   
2016
 
Current:
               
Federal
  $
1,124,000
    $
1,817,000
 
State
   
128,000
     
316,000
 
Foreign
   
132,000
     
171,000
 
Total current
   
1,384,000
     
2,304,000
 
Deferred:
               
Federal
   
(592,000
)    
152,000
 
State
   
(67,000
)    
(61,000
)
Total deferred
   
(659,000
)    
91,000
 
                 
Total
  $
725,000
    $
2,395,000
 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
Year Ended March 31,
 
   
2017
   
2016
 
Expected Federal income tax expense
U.S. statutory rate
  $
(1,434,000
)    
34.0
%   $
2,092,000
     
34.0
%
State income taxes, net
of Federal benefit
   
40,000
     
-0.9
%    
169,000
     
2.7
%
Permanent differences, other
   
156,000
     
-3.7
%    
47,000
     
0.8
%
Dividend received deduction
   
(302,000
)    
7.2
%    
-
     
0.0
%
Section 831(b) benefit
   
(281,000
)    
6.7
%    
(316,000
)    
-5.1
%
Change in valuation allowance
   
3,868,000
     
-91.8
%    
557,000
     
9.0
%
Domestic production activities deductions
   
(64,000
)    
1.5
%    
(193,000
)    
-3.1
%
Income attributable to minority interest - Contrail Aviation
   
(45,000
)    
1.1
%    
-
     
0.0
%
Deferred benefit for outside basis difference recorded on Delphax CFC's
   
(1,015,000
)    
24.1
%    
-
     
0.0
%
Deferred state income taxes, net of Federal benefit for Delphax
   
(102,000
)    
2.4
%    
-
     
0.0
%
Other differences, net
   
(96,000
)    
2.3
%    
39,000
     
0.6
%
Income tax expense
  $
725,000
     
-17.1
%   $
2,395,000
     
38.9
%
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
   
Year Ended March 31,
 
   
2017
   
2016
 
Inventory reserves
  $
785,000
    $
504,000
 
Accrued vacation
   
475,000
     
439,000
 
Stock option compensation
   
108,000
     
141,000
 
Property and equipment
   
169,000
     
-
 
Warranty reserve
   
39,000
     
74,000
 
Accounts and notes receivable reserve
   
290,000
     
181,000
 
Employee severance reserve
   
460,000
     
-
 
Net operating loss carryforwards
   
6,461,000
     
5,353,000
 
Federal/Canadian tax credits
   
4,648,000
     
4,784,000
 
263A inventory capitalization
   
10,000
     
60,000
 
Unrealized gains/losses and outside basis difference for CFC's
   
1,995,000
     
-
 
Intangibles
   
43,000
     
-
 
Other
   
78,000
     
112,000
 
Total deferred tax assets
   
15,561,000
     
11,648,000
 
                 
Deferred revenue
   
(35,000
)    
(52,000
)
Prepaid expenses
   
(505,000
)    
(563,000
)
Property and equipment
   
-
     
(70,000
)
Intangibles
   
-
     
(388,000
)
Gain on marketable securities (OCI)
   
(94,000
)    
-
 
Outside basis difference
   
(34,000
)    
-
 
Total deferred tax liabilities
   
(668,000
)    
(1,073,000
)
Net deferred tax asset (liability)
  $
14,893,000
    $
10,575,000
 
Less valuation allowance
   
(14,698,000
)    
(10,830,000
)
Net deferred tax asset (liability) after valuation allowance
  $
195,000
    $
(255,000
)