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Income Taxes - Temporary Differences in Financial Statement Carrying Amounts and Tax Bases of Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Deferred tax asset    
Inventories $ 2,764,000 $ 2,401,000
Program accrual 9,742,000 8,277,000
Vacation pay accrual 864,000 772,000
Accrued bonuses 37,000 1,707,000
Bad debt expense 2,143,000 1,450,000
Stock compensation 1,536,000 1,414,000
Domestic NOL carryforward 543,000 609,000
Foreign NOL carryforward 6,322,000 2,554,000
Tax credits 1,582,000 842,000
Lease liability 5,812,000 6,209,000
Accrued expenses 696,000 570,000
Unrealized foreign exchange loss (1,182,000) 3,220,000
Capitalized R&D costs 7,140 4,600
Deferred tax assets 37,999,000 34,625,000
Less valuation allowance (3,317,000) (3,853,000)
Deferred tax assets, net 34,682,000 30,772,000
Deferred tax liabilities    
Plant and equipment, principally due to differences in depreciation and capitalized interest 32,336,000 36,158,000
Lease assets 5,617,000 6,079,000
Prepaid expenses 1,406,000 1,685,000
Deferred revenue 0 777,000
Other 366,000 529,000
Deferred tax liabilities 39,725,000 45,228,000
Total net deferred tax liabilities $ 5,043,000 $ 14,456,000