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Note C - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Property and equipment, gross $ 56,205 $ 53,886
Less: accumulated depreciation and amortization (35,868) (34,596)
Property and equipment, net 20,337 19,290
Land [Member]    
Property and equipment, gross 1,200 1,200
Building and Building Improvements [Member]    
Property and equipment, gross $ 3,721 3,721
Building and Building Improvements [Member] | Minimum [Member]    
Depreciable Life In Years (Year) 7 years  
Building and Building Improvements [Member] | Maximum [Member]    
Depreciable Life In Years (Year) 39 years  
Machinery and Equipment [Member]    
Property and equipment, gross $ 29,351 28,185
Machinery and Equipment [Member] | Minimum [Member]    
Depreciable Life In Years (Year) 3 years  
Machinery and Equipment [Member] | Maximum [Member]    
Depreciable Life In Years (Year) 12 years  
Office Equipment [Member]    
Property and equipment, gross $ 5,005 4,883
Office Equipment [Member] | Minimum [Member]    
Depreciable Life In Years (Year) 3 years  
Office Equipment [Member] | Maximum [Member]    
Depreciable Life In Years (Year) 5 years  
Vehicles [Member]    
Property and equipment, gross $ 313 209
Depreciable Life In Years (Year) 3 years  
Vehicles [Member] | Minimum [Member]    
Depreciable Life In Years (Year) 3 years  
Leasehold Improvements [Member]    
Property and equipment, gross $ 16,615 $ 15,688
Leasehold Improvements [Member] | Minimum [Member]    
Depreciable Life In Years (Year) 1 year  
Leasehold Improvements [Member] | Maximum [Member]    
Depreciable Life In Years (Year) 15 years